[WanderingMinstrel]

Last week, my data connection stopped working SOMETIMES.

It works first thing in the morning after powering back on. Keeps working for an hour or so. Then, one of the internal programs tries to connect and can't do it. Recurring "Can't connect for an unknown reason" notifications pop on. The program tries and tries to connect. And can't. Phone heats up. Battery drains. It's not a location issue because I am using the phone in the same place (even the same room) most of the time.
I tried the ##3282# fix in post #1.
The password (AAA-secret) on the page was not my pin number. When I changed the setting, I lost even the sometimes connection and could not data connect at all--even after a power-down and wakeup. So I changed it back to Sprint's secret word.
Then I called Sprint. We did the ##3282# routine and couldn't get a successful profile update confirmation. We tried a couple of other things unsuccessfully. The TR went away for a few minutes. When he came back, the answer was to do a hard reset.
Which I did. Data connection worked perfectly after it and also after my Sprite Restore.
Next morning though, same deal. Worked at first after powering on. Then stopped when one of the internal programs tried to connect automatically an hour or two later.
Called Sprint again, yesterday. This time their solution was a phone exchange.
A new TP is coming next week.
Meanwhile, the data connection still works SOMETIMES. I tracked the internal program triggering the issue down to Windows Live, checking for mail updates. I haven't installed any new data-requiring apps for 3 weeks and the problem is just 1 week old.

Unless anyone has any ideas (if they had the patience to read this whole long thing--lol), I am assuming the new phone will solve everything. Unless it doesn't. In which case, I'll report back.
I just hadn't seen this particular piece of this problem show up before. Thought someone might be interested.