Backup Camera glitches after battery changed

I just got my battery changed at a Hyundai Dealership and after that I've been experiencing some glitches with the back up camera.

I noticed this when I got the battery changed. I was in a bit of a rush to reach work so, when I put the car in reverse the camera was okay. But while reaching work the head unit only showed black screen (i didn't think about it that time). After that while driving regularly when i put my car in reverse the backup camera shows up and then goes black.... Then for the whole day it doesn't work.

On the next day the same thing, initially it works and randomly goes black.

I called Hyundai and they said "we charge 170$ x 2hr to inspect as it might be a coincidence that the camera stopped working and all".

Then i hopped on google and found out that this happens sometimes after battery changes. And also tried some fixes

Fixes tried:

Resetting the camera using the pin hole. It worked only once when the camera showed and then immediately went black.

Then some stated wait or try cold reset (let the car shut down for 1 hr) tried... Always works for the first reverse them goes black.

*Other than this i haven't tried anything*

Now should i wait for it to reset it properly or contact hyundai or what should i do?