I'd call it in and hope they have some tech bulletin but get a repair quote to decide if you will continue with this model.
Has anyone every encountered an issue like this?:
I have used a SONY HDR-AX2000 Camera without problems for a couple years, but have just recently noticed these lines appearing in my recordings.
The lines are not visible in the viewfinder during recording.
I have tried resetting the camera and using new SD cards, but the problem persists and has gotten worse in the last 3 weeks.