ResMed S9 / ResScan lost an hours worth of sleep data

[dave21]

Hi,

In the UK we changed our clocks forward on Sunday morning to British Summer time so we're now in sync with USA and I forgot to check the clock had updated on the S9 on Sunday. After spending Sunday night/Monday morning on the machine I notice there's a very strange irregularity on my graphs.

There's an hour missing exactly between 1am and 2am on Monday morning. That suddenly jogged my memory that it's probably to do with switching to British Summer Time, although it's strangely a day late as most clocks usually change between 1am and 2am.

So I then checked the clock on the S9 and the clock is still set back in Winter time. So even if the hour gap in the graphs were to do with a 1 day late summer time switch (which is entirely plausible), the clock is still set incorrectly and doesn't make sense.



I also noticed the following

1. Flow stops between 1am and 2am for 1 hour
2. Flow Limitation stops between 12:30am and 1:20am for 50 mins then starts for 10 mins then stops again
3. Leak stops between 12:30am and 1:20am for 50 mins then starts for 10 mins then stops again
4. Snore Index actually has a complete graph
5. Pressure stops between 12:30am and 1:20am for 50 mins then starts for 10 mins then stops again
6. All the graphs are identical top and bottom views
7. All graphs top and bottom biews all start at exactly the same time around 7:30pm.
8. I awoke at 3:10am to get up for my weekly long commute, so bearing in mind the clock is an hour behind on the S9 the 3:10am would reflrect as 2:10am and that's where the additional 10 mins of graph shows on the right hand side of the graphs.

I had the thought again that the graphs might be skewing themselves, and there does appear to be a slight skew Flow Limitation and Leak graphs but everything else is matching up apart from a segment that's cut out. Likewise the start of the graphs for Flow Limitation and Leak do start the same time as other graphs. I could almost suggest there was a power outage and power was restored but I would usually wake up if that was the case and the snore index is still continuing throught the hour of loss graphs.



If tonights graphs show something similar then I think I'm going to have to let the S9 format the card and see if this corrects the gaps.

Thanks
Dave

[dave21]

Darn, looks like it's a bad break, if I take out the section of break and move it closer together (removing the hour gap of what looks like no data) it looks like the graphs join up.



I've taken a backup of my card, formatted it, placed it back into the S9 and will see what happens on future nights.

Thanks
Dave

[scrapper]

You can probably live without that one hour of data or just the illusion that you are missing one hour of data......jmho

[pzac]

When I first got my ResScan software and did my first download I had similar problems with loosing hours of data especially when I took naps on the same day - 2 sessions the same day - it would loose one of them.
I thought it might had to do with the clock on the machine not being set. There was no way to set the clock thru the software. And then I found out how to get to the clinical menu setup and this is where you can set the clock.
After setting the clock along with some other items and have not had any more problems. In fact when I downloaded again over writing all sessions the gaps (missing hours) disappeared.
I'm not sure if this was your problem, probably not but maybe this info might help others.

[kf10]

One day I lost few hours of data on the FLOW section. When I change the display from 8 hours to something else. The data is back. It only happen once. May not relate to what your post at all.

[Uncle_Bob]

Dave

I suspect the reason for this may be the ResScan software itself. I had the missing data problem with my S8 and ResScan 3.7 on occasions. It looks like 3.10 may still be buggy
It will be interesting to see how often this happens, especially now we are dealing with more data.

[dave21]

Yeah, really hope 3.10 isn't in the alpha stage otherwise it might continue to happen, but I believe nord said (apologies if I got name wrong as I'm reading these posts whilst travelling on my iPhone) that he's seeing it too and abfew more and it's starting to look like it might be a firmware issue on the s9 - j really hope it's not.

Thanks
Dave

[gpk111]

I also posted this copy under another string : S9 Skew investigation - your help needed!
by gpk111 on Mon Apr 05, 2010 8:31 am

Dave,
Apologies for my confusion. There is a "skew" discussion going on and also an "hour lost" discussion for the S9. After 14 days of intense scrutiny (no skew, no gap), I now find an hour (exactly) gap in the detailed data. The summary data looks accurate.

I also noted that on the "missing hour" night (last night) the events prior to the gap make no sense. It shows normal breathing, but an event is marked (twice in this case). The events after the gap are normal.

I believe I have a "gap" problem and not a "skew" problem, but maybe they are related and perhaps you can add some perspective.

Thanks
Gerry in Florida

[gpk111]

PS I'm not overly concerned, especially since the summary data looks ok.

Bottom line: Should I reformat the card or leave it alone?

[dave21]

I've hit both the skew problem and the gap problem where exactly an hour goes missing. Both fixed it for me by formatting the SD carrd (I did it in my Laptop) but you can do it on the S9, and then starting to power cycle the S9 on a nightly basis.

[gpk111]

Power cycle is unplugging or hitting the left button?

[dave21]

Sorry that's a very good point, I power cycle by unplugging the cable from the back of the S9 and wait 30 seconds (for any residual power to drain out of the circuit) before plugging back in again. You should then get a black screen with S9 Series in white text which tells you it's cold booting the S9.

[DaveL]

Dave21--I read your title. First thought that jumped into my mind, "your machine is sleep deprived."

Sorry. I've had sleep apnea too long.

DaveL
Toronto

[dave21]

LOL - hadn't thought of that one. Maybe my S9 needs more sleep or maybe our Apneas are affecting it and it's getting apneas so it needs it's own CPAP machine!

[Nord]

Sorry that's a very good point, I power cycle by unplugging the cable from the back of the S9 and wait 30 seconds (for any residual power to drain out of the circuit) before plugging back in again. You should then get a black screen with S9 Series in white text which tells you it's cold booting the S9.

Hi Dave

Back from a 4 day trip, where I travelled with the S9 and H5i...

I was going to boot the S9 each day by unplugging and leaving the SD card in the machine for the entire time. I have found skewed data that is getting progressively worse.

Also... It seems to me that the 3 sec power button is just a sleep position where there is some energy saving - not truly a "hard boot". As we discussed before, "hard booting" can only be performed by unplugging from the wall or power brick. And since many are finding that hard booting seems to correct a multitude of problems with data collection... it would seem that temporary memory is a possible culprit for many of the symptoms.

I've also found some other things about data collection that I am still "thinking" about... I'll soon post when I've got to the bottom of the idea.

Nord