Hi
We’ve tried really hard to repo this internally, but can’t. We have almost the same Mac here (I think it’s the 5500M, not 5300M) which has not had this issue.
Is there anything you can think of that might be different or special with your machine? External docks? Any graphical software you use? Is the battery okay in the device?
We’ll keep it in mind and I’ll let you know if we come across it. Without an internal reproduction though, we’re mostly guessing what could be causing it