360 Charging issue - Display pulses on charger and does not advance topic

I got my 360 a couple of months ago and I had no issues with it at all until a couple of weeks ago. Sometimes it would stop charging at around 60%. Started happening more frequently and then I noticed when it had been on the charger for a while, the display would brighten and then dim and repeatedly pulse like this and quit charging. I only found one reference online about this and it suggested a problem with the internal charging hardware so I took it back to AT&T and exchanged it for a new one under warranty. The new one is doing the same thing so now I am wondering if it is a 5.0.2 issue but I am not seeing any outcry over it.

I am kind of at a loss as to what to do here. Looking for suggestions from other users. Have any of you heard of this problem and can point me in a direction for help? My next step is to contact Motorola but not looking forward to that.

Thanks in advance