I have experienced exactly what the OP describes (I call them slowdowns) for the past month or so. I use an ASIAir Plus with an iPad.
In August, the ASIAir app was updated by ZWO and Apple updated my iPad's OS to 15.7. I posted about these slowdowns in a thread on ZWO's forum and I've twice uploaded logs via the ASIAir app for them to examine. By the end of August, I reset my ASIAir Plus firmware, uninstalled the app from my iPad, and then reinstalled the app which then updated the ASIAir firmware once it reconnected. I saw no change in behavior.
When the slowdown happens, I'll produce a 20-minute total duration stack, with 10-second subs, and the result is 5-7 total stacked subs (about 1 every 3-4 minutes) and 0 ignored subs. My iPad will continue shooting 10-sec subs after the 20-minute total duration and will only stop once that 5th, 6th, or 7th sub is finally downloaded to my iPad and the app indicates the ASIAir is idle. Until the idle status indication appears, the app indicates it's still shooting subs and stacking.
Two or three times, when I was impatient and tried to stop stacking while it was in a slowdown, I poked around the main and camera menus to see if I could regain control. Not really! While stacking was still happening (even though I'd stopped and exited live stacking), the ASIAir disconnected and then eventually reconnected, as the OP has experienced.
The past week I've been live stacking up to an hour duration (about 300 10-second subs) WITHOUT calibration frames and have not experienced a single case of this behavior. But every time I've tried using calibration frames the past week has produced the slowdown. Good to know I can use calibration frames shooting the plan mode!
My take on this is that either the latest version of the app (more likely) or iPadOS 15.7 (less likely) gets the credit. I think the ASIAir Plus is simply choking on the workload. Processing the calibration frames seems to be a relevant factor. My iPad doesn't know about the missing 95 frames in a typical 20-minute stack. I'd accuse my network connection of losing them, but I use CAT-5 ethernet directly to my network with a static IP assigned. Only the iPad is running wireless.
I'm hoping version 2.0 ASIAir will cure the Live Stacking slowdowns or that they'll push out a 1.9.3 update sooner.
Edited by reformedalpineskier, 29 September 2022 - 08:38 PM.