Locus quits after about 30 minutes - an old problem
This is a two year old problem and it should actually be done.
I had now the same problem several times in the last two weeks. The Locus version is currently 3.48.2 on a Motorola Moto G6 with Android 9. The battery optimization for Locus is definitely disabled. Nevertheless Locus sometimes claims, but not at every startup, that it is switched on. After about 30 minutes the position is no longer tracked. The map can't be moved anymore and doesn't react on clicking. After stopping and quitting and restarting the app, the track will be continued and recorded.
This is not nice and only since a few weeks or maximum two months.