DR900s 2ch camera problem, see description.

Need some advice, I have the DR900s 2ch and its had some issue lately seeing it returned to be fixed twice in the last month when it was replaced with a refurbished model last week. I put it in the car Saturday and today went to down a clip only to get this mess. The rear camera is fine, I went back through the saved clips and many have this issue or similar, never seen this before on this DC. BTW it has a new BlackVue SD card and it wasn't a few hot day today. Given the rear is fine I'm thinking it's a camera issue as it comes and goes only on the front camera.