They have changed it all now from Beta 21.16 (not sure its for the better, but you can read the comments in the beta forum - look at the 965 beta forum comments also.)
I have the beta enabled, auto detect turned on but still nothing!
Did you know that beta firmwares are unstable releases, not finished and stable, also the stable presents issues, so more the BETA...
If you are running the beta, you should post in the beta forum
Maybe your MHR detected and config by the watch is wrong, and too high, this is why you hit the wall before you finish the test, by the way, this test is very hard, so try to do when youre completely recover and with full energy and each 4 to 8 weeks,