Lumia 920 doesn't stay charging

The company I work for gave my Boss a new company phone, and now I'm kinda using his red 920. This phone won't stay charging for some reason, every 10 minutes or so, I have to unplug it and re-plug it back in, then it continues to charge. I've tried every different cord and charger combination available to me and nothing changes.

I've read that some of the 920's had hardware problems, but when searching for this problem, I don't see any similar complaints. Have any of you people seen this problem on a Nokia phone before? this isn't my main device so it's not killing me or anything, I'm just wondering what the deal is.