S7 Edge 4G LTE Icon Blinks and Battery Life Plummets
I have owned my AT&T S7 Edge (6.0.1, Build MMB29M.G935AUCS4API2) for many months now, and love the phone. It is better than my previous Samsung AT&T phones in all aspects: Captivate S, S3, S5. The battery life is great.
But.... many weeks ago, I noticed that my battery life decreased significantly, for no apparent reason. The main culprit, according to the Battery Status app, is "Cell standby". It seems to be some mode that the phone gets into, for unexplained reasons. When it is in this mode, the icon display at the top of the phone will flash the "4G LTE" icon briefly about once every 4 seconds.
Rebooting and cache clearing doesn't seem to get it out of this mode.
However, I did determine that this returns the normal operation:
-- Turn off Mobile Data (temporarily)
-- Restart the phone
-- Turn ON Moble Data
After the above, the battery life returns to normal, the Cell standby drops way down on the list of battery usage, and life is good. It often remains in this fine state for weeks at a time.
While I still do not know for sure what triggers this behavior, I have a theory. I just now got a phone call and the phone is back into the "bad" mode. I can tell that some phone calls sound remarkably better than others -- and this was one of them. It came from another phone on my account (a Samsung S6), and I suspect it was VoLTE or HD voice. In any case, it was much clearer than normal.
But after that call ended, the flashing 4G/LTE icon and the Cell standby returned.
Any idea what the problem is?