After running the phone for over a week with the auto-sync feature turned off and noticing how much better the battery life is, I decided to try some of the newer suggestions in this thread.
Since my constant sync problem involved the calendar, I first "unchecked" it and turned auto-sync back on. No problems, gmail and contacts seemed to get sync'ed, just not the calendar, and battery life is decent.
As the next step, I deleted the calendar (data and storage) then powered off the phone, pulled the battery and took a break. After a few minutes, I put the battery in, powered up, manually sync'ed the calendar and left it in auto-sync mode. So far, the problem has not returned.
I know I tried deleting the calendar (data and storage) before, and also pulled the battery, although I did not wait as long before powering it back up, and that DID NOT fix the problem before, but now it has!
I will just monitor the situation and re-post if the problem happens again. One thing I know from experience, "If a problem can go away by itself, it can come back by itself!" And I have not seen any kind of definite explanation of what causes the problem.
And I am really puzzled how pulling the battery can make any difference. Are there capacitors that have to discharge? How long is "long enough?"
BTW - I took a complete inventory of apps in case I had to do a factory reset. I have 52 apps installed, and another 73 are listed when I check the "all" button in the app filter. Total is 125. All on one little phone, and it still has lots of room to spare. Amazing...
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