I uploaded some tracks and some info I hope will help you. Please look in my profile for the tracks.
I have two tracks: Wildcat before (at Monument Valley), and Wildcat Edited. I had an extraneous point happen here where I had a huge gap in data. That was when I got a notification that Supreme Court Justice Scalia died. I have edited the route for your potential use on the Wildcat trail, but I'll do a triplog for that first.
More interestingly I uploaded two tracks called Betsy's MMH and Betsy's RS. MMH is by MapMyHike, and RS is RouteScout. I ran both apps at the same time. Here's what I found. I turned on MMH, never looked at it again till I stopped recording. I then turned on RS, and hit my "home" button, minimizing the app. You can see a short gap in data right after I start. I was getting texts, and emails, the whole time, and there are gaps all over the place. If I didn't make sure after each notification to make sure RS was the active app, it just stopped working. It even stopped if I minimized it without a notification
. RS (or HAZ Tracks) never did that. Interestingly, I never looked at MMH until the end and it recorded without interruption.
That leads me to believe that it's something in the RS app caused by changes in Android, but you sort of knew that. I just hope you can fix it because RS is superior in all other ways if it will just keep recording!