Ah, hopefully that was it! I’m betting Mini was having a communication fail with the other two, and trying to record over the top of them, creating messy timeline data that the processing engine was becoming endlessly confused by.
Aside: Swiping any of the Arc family of apps closed will only stop them temporarily - they’ll get auto restarted by iOS some minutes later (most of the time - it’s not guaranteed to happen).
Those should be fine. The only interaction with other location / navigation apps that I’m aware of is CarPlay and/or Google Maps navigation sessions while plugged in to power in a car, which for some reason can overload things and cause Arc to get terminated.
My assumption in that case is that it’s either a memory use thing or a device temperature. It seems that if the phone isn’t plugged in there’s less risk of termination, so that leans towards the device temperature theory - phones heat up when they’re charging, and navigation sessions request the highest location data accuracy (higher than Arc requests), which means higher sampling rate, higher CPU usage, and higher device temperature.