JVC hm700 Issue

Howdy

about a month ago I accidentally left my JVC left on in it’s bag for several hours. Naturally, it got rather warm!

Since then I have had issues with horizontal lines flickering mostly at the bottom of the frame and rippling up, through the rest. It seems to increase with camera movement – pans & zooms and at higher apertures .

I expect it’s stuffed (although it occasionally works ok; not so often I’d trust it on a job!) but can’t find any other examples of this issue so wondering if anyone can explain what’s going on?

Example below

Any advice, suggestions most appreciated.