In a way, it almost sounds like a memory leak, building until the player app can no longer allocate and crashes. That would explain why the GPSapp would still run for a while but eventually crash too. No explaination of why only on DC power, though. Unless there is something in your config.ini tied to DC vs. AC. I am also thinking it might be a bad memory hit, but (again) no explaination why only on DC.

I really wish you could capture a console log. It really seems like the player app is going down - hard. Or getting blocked by a resource request that cannot be met.

Does it happen with a vanilla config.ini?