KC's sleep study and therapy

If the data files are corrupted on the SD card and you copy them...you have copied corrupted files but I don't know that it hurts anything on the new card.

You haven't lost the detailed files...you have them in OSCAR anyway. Plus you can also just physically retain the old SD card.

Your machine stores the summary numbers (not detailed data) on the machine and that data goes back on the SD card. So summary numbers aren't lost.

Since the goal is to rule out a bad SD card first....just hold onto the old card and try the new card.
If it doesn't resolve the issue by using a new card then it doesn't matter anyway if the new card doesn't have all the files on it does it?

I doubt that your machine is actually stopping 20 plus times a night but that's why people want reliable data....to prove it.
Could someone sleep through that much actual off and ons going on during the night???? I don't know. People sleep through all sorts of things and others get woke up when a gnat farts.
I can't say for sure one way or the other at this point so nothing is impossible IMHO.

I wonder if power supply might be involved? Do you know if your line voltage is stable and in the acceptable range? I don't suppose you have a spare power brick to swap in and see if that makes a difference?

My understanding is that when a ResMed machine loses power, it picks back up were it left off rather than restarting at initial settings. But, as Pugsy asks, could you sleep through 20 episodes of losing pressure, which a power loss would cause?

If you are using OSCAR, OSCAR makes a backup of all the data from your SD card. I would just keep the old card and not try to copy the data to the new card.

Using another SD card did not solve the problem. Last night there were 13 sessions and the interruption time was more than one hour and a half.

I suppose the line voltage is stable and in the acceptable range. Unfortunately I do not have a spare power supply to try.

I am a light sleeper and am almost sure that losing pressure would have woken me up, it is hard to breath with the mask and no pressure. So maybe the machine works but it does not write to the SD card.

I looked in the DATALOG folder of the SD card. There are 118 files for last night, 19 groups of 6 (_SAD _PLD _BRP) plus another 4 (_EVE _CSL). I know nothing about how and when the machine writes on the card... What causes a new session? Only the stop/start or other events as well?

KC1965 wrote: ↑

Tue Feb 15, 2022 5:12 am

What causes a new session? Only the stop/start or other events as well?

Yes...supposedly anyway. I have seen this happen on some Respironics System One models in the past but I don't recall ever seeing it happen on ResMed machines. I personally examined the SD card from a System One machine that was showing over 40 different sleep sessions for one night. The numerous files created with each session also ended up causing the creation of an extreme number of folders as well...totally screwed up from what we normally saw... Was using SleepyHead, at the time which of course OSCAR is based on, and when looking at the timing of the start and stop of each session a large number were just saying one minute. Meaning like one ending session time would be the beginning time of the next session...to the exact second.
Anyway I have seen this on a small number of reports here...some worse than others. We never could figure out the cause of the problem. Some people here elected to just live with it since it didn't happen really bad every night anyway.
I always suspect a problem with the software in the machine writing to the SD card for some reason but I couldn't ever prove it.

The machine that I personally had experience with that was doing it never did the exact multiple session thing for me when I used it but it ended up doing other weird crap like dropping files when they shouldn't be dropped and the machine was under warranty and it went back to cpap.com and a new machine was issued that didn't have that problem. Long story as to how I was involved with it. I was never told what the problem was.

I do think that the problem wasn't with the machine's ability to blow air or sense stuff in terms of doing it's primary job but instead it was a problem with the software for recording to the SD card. I could never prove it though and I have always felt like when a machine doesn't do everything it is supposed to do correctly....I just have a problem trusting it.

If you were within your warranty period (which I assume you are not at this time) my advice would be to contact supplier and get it returned under warranty.

Do you happen to have a spare machine? If you do you might consider contacting acbio.com and see if they have the ability to check the machine as well as the software writing to the SD card. I know they can do repairs on ResMed machines now but I don't know if that includes fixing possible software issues. It won't be cheap IF they can even do anything.

My guts tells me the problem is in the software writing to the SD card but I can't prove it and we have already tried all the usual troubleshooting things to try to identify some other reason for the oddities.

Pugsy wrote: ↑

Tue Feb 15, 2022 8:29 am

I do think that the problem wasn't with the machine's ability to blow air or sense stuff in terms of doing it's primary job but instead it was a problem with the software for recording to the SD card. I could never prove it though and I have always felt like when a machine doesn't do everything it is supposed to do correctly....I just have a problem trusting it.

I think exactly the same about my machine: it probably does its primary job but it does not record it. Therefor I also have a problem trusting it.

After checking Oscar daily data for the previous year, I realized that the problem is older than I initially thought. I have found interruptions in January 2021 but they were for a short period of time and appeared now and then, once or twice a week, so not noticeable. During the time, these "pressure gaps" became longer and more frequent, and now they appear every night. It looks like the problem is getting worse over time.

Pugsy wrote: ↑

Tue Feb 15, 2022 8:29 am

If you were within your warranty period (which I assume you are not at this time) my advice would be to contact supplier and get it returned under warranty.

Do you happen to have a spare machine? If you do you might consider contacting acbio.com and see if they have the ability to check the machine as well as the software writing to the SD card. I know they can do repairs on ResMed machines now but I don't know if that includes fixing possible software issues. It won't be cheap IF they can even do anything.

The machine is out of the warranty period. I do not have a spare machine so I will probably rent one for a month or two and send mine to diagnose/repair. I've already contacted the supplier about the issue and will see what can be done. (I live in Europe so no acbio.com unfortunately)