An update. I broke down and spent an entire day doing a factory reset then rebuilding my phone. I could not get any of the backup apps including Helium to back up my app data - so that was a day of pain I don't want to relive anytime in the near future.
Basic outcome: no change and I'm liking MM less each day:
- battery life is about 50% of what I had with the latest security update just prior to MM install
- Bluetooth radio range seems to be 1/2-1/3 of what it was before. I can hold the phone in my hand, turn my back to my Bluetooth speaker and get only about 10 feet before it starts dropping out. I used to get 40'
- having screen timeout issues, it's not following my settings and staying on too long. I've even turned the screen off, out the phone in it's belt clip, and minutes later pulled the phone to find it quite warm to the touch and the screen active
- 2-3 record per day on it's own. The phone will be cleared of active apps & windows, sitting in my console or on my desk and I hear those wondrous AT&T boot up tones. It's even happened once when I was reading Gmail.
The only positive thing I have to say about MM is the addition of WiFi calling. I've actually had occasion to use it while traveling this week where cell coverage was non-existent