S9 Alien turned machine off but flow missing too. Any Ideas?

This is getting too common. Night before last it went off too. This was last night. I barely remember turning the machine back on this morning, but not turning it off and I'm sure I would have taken the mask off if I had. By the snore line it appears that I didn't. No idea why the flow is missing for the first half of the night.
I already have a "power out" on the strip with the machine because I thought maybe the outlet was the culprit.
Something is going on with it. It's close to 2 years old so I guess I better take it in to the DME. It's random though.
Anyone else have this problem or any ideas.
Smartstart is off.

Hello,
When I first picked up my new S9, it would periodically display a message stating the sdi card could not be read. I had to reseat it when this happened, and sometimes lost data. The machine got swapped out, and this has not happened again. I don't know if that helps, could be a temporary loss of data from not reading the card?

howdy,
My not-new VPAP has been doing this for going on 3 weeks, now. Blank spans up to 2.5 hr. Because the flow rate looks like it's starting back up on ramp -following the blank space, I figured the machine was offline... but beats me how I could sleep that long with my SleepWeaver on and not get hypoxia!? I'd sure like to know if it's aliens, Sun Spots or what?!
On an unrelated item, my Zeo is back at Zeo; it quit recording on 7 Nov and they said send it back. Puzzling times.

I just dumped into Sleepyhead and got that missing flow data but still the 2.5 hour gap. My O2 didn't drop significantly during that time, so that's a good thing. I had problems a couple of months ago and replaced the card, so it shouldn't be that. Hmmm.