I am having the same charging problem. I turned off the WiFi, and lowered the backlight time to 20 seconds, but that didn't help. I've had this phone for a week. I had my previous Curve for less than a month, when the keyboard froze, so I got the replacement phone, and it won't charge. I love the features the phone offers, but I have to wonder about the quality.
Speaking from experience, Sprint will replace your phone in the first 30 days for a manufacturer defect, (such as a frozen keyboard or charging issue). But the replacement phone will not have an additional 30 days, only the balance. They talked me into buying the insurance. I guess we'll see how that works when I return this one for the charging defect.
Yes same problem here and mine is a company phone. My company plans on buying like 15 more but I am going to tell them to hold off until I can figure out what is wrong with it. It doesn't hold a charge and it seems to only charge when the clock that comes on when the charger is first pluged in shows. If you hit the back button to check emails and remove the clock from the screen, it stops charging.
The problem stopped for me when I completely drained the battery and did a full recharge. Since then, I charge it every night, with "Full Power Off." A charge lasts two days, now, if I need it to, (although I don't use it as much as some people do.) I had the same clock issue you refer to. That's because it wasn't fully powered off. It does seem to be an inherent engineering problem, but can be circumvented by doing the full power off.