C6903 would previously charge using an official Sony dock cord. Yesterday, however, the phone started making the 'phone flat' beepjng noise (it was close to flat), so plugged into the dock to charge. The beeping continued every few seconds, the screen rotation started playing up (I do have a screen rotation lock that hasn't been a problem) and the phone won't fully charge (the charge symbol is there, just keeps dropping. The error message "the connected power source is not sufficient. The battery is draining faster than it is charging. Minimise device usage while charging" popped up. It does charge VERY slowly if the phone is off airplane mode and the screen is off (it charged approx 30% in 10 hours, this way).
No rogue apps, etc. I reset to factory settings and the problem is still there. Phone charges fine using standard micro-usb.
Here in the NL, the carrier (KPN) send your phone away for minimum 2 weeks (& will not give you a replacement), and they will likely just test with the standard USB charger, which is fine.
Anyone experienced this & any advice would be greatly appreciated. Thanks, Adam