I have the same problem. So osmand is working for some time and than it suddenly closes. Also the android layer dies. After some time I can start osman again and go ahead for some time. Quite annoying behavior. But how to fix this??
Just the thread about memory usage https://forum.sailfishos.org/t/tuning-the-oom-killer-low-memory-killer/ is a bit too mutch for me. So I have no glue what to do…