I have also have had MetaRecorder stop on me. Nine out of 10 times it’s because I bone it and run two hours in wav, but I’ve also seen it stop kinda randomly when I have plenty of space on my phone. I have been unable to reproduce it. It’s pretty rare maybe one in 20+ recordings but I’ve seen it for sure. I do try to use CIF when I can, but I am unsure how lossless the export from audacity to wave is, and a present anything else I could be doing to assure that that its lossless.
Considering the phone is usually deep in my pocket, even if I’m monitoring, MetaRecorder still passes the signal if it stops recording so you can’t tell if you’re recording stuff just by monitoring really the only option for remote monitoring is a smart watch