I had a similar problem with my OP6T. My hike tracking app would constantly turn off randomly in the middle of a hike. Having used Android for years I went th

I had a similar problem with my OP6T. My hike tracking app would constantly turn off randomly in the middle of a hike. Having used Android for years I went through all the typical battery optimization settings, but nothing worked. I contacted the app developer and they had no idea what was causing it. Eventually I stumbled on the "Lock" feature, which as far as I know is specific to OP, and that solved everything. I'm pretty annoyed with OP about it to be honest. Android has app-specific battery optimization settings built in but they just completely ignored them.