I have had the front camera randomly misbehave. Some times a scrolling display view and/or a dark distorted image. When the issue became more frequent, I bought a cheap replacement (~$27), however, after installation it was apparently designed as a rear view camera as the image was inverted (left/right) and it had the rear fixed guidelines. Also the 180 view did not work. Camera also would not program/calibrate with ForScan. So returned it and reinstalled the old camera as is. But, the misbehaving went away for a while, and now started coming back but much less frequently. Suggesting a contact issue.
As I did not do the installation myself, I didn't check of corrosion, next time might do as you did and add die electric grease after cleaning the contacts.