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Ultimately, the problem ended up being my phone: RWGPS' software would not play nicely with the older Android OS I had, which from memory was maybe 3 versions behind. I got a new phone and have had no problems since.
YMMV. Good luck.
Thanks for the update. Maybe that is why Maps.Me stopped working well on my Android 7 phone? Phone works fine, but that app started mis-behaving. That said, I only used Maps.Me as a backup if my dedicated GPS stopped working, so not buying a new phone for a while.