I got the same problem twice! My previous phone was a Motorola V300 and the charging started to get flakey. I'd have to unplug from the handset and re-plug. This got worse over the months and finally, it stopped so I got a new V300. Guess what? Well, the same problem started happening again!
Now my phone provider (Tmobile) has the audacity to tell me that since my phone is no longer under warranty (past 1 year), they will replace it with the same phone for $70. LOL. Why would I want the same phone when this problem seems to be symptomatic with this model?
When I use the battery up completely, plug it in so I can call when it is charging, it goes off because battery is empty. This implies that even when plugged in, the phone is only running through the battery. Anybody else have this problem?