Super Gameboy random interference for 0.5sec

Hiya!

after 5+ years I started using my Super Gameboy again (not clock modded, stock) and I have noticed there is some random interference for a split of a second, like a parasite that distorts a horizontal area ... you must pay attention to see it and it does not affect gameplay , the games play fine.
Anyone has any idea why this happens? I am using it with a 1CHIP snes that I modded with ikari_01's goodies (50/60hz auto-switch, superCIC, IGR) and the system works perfect with the SD2SNES.
I have opened the Super Gameboy and saw 3 smd caps, could they be the cause of this? I have been playing for ~1 hour various games, the parasite pops from time to time and in various screen positions...

thanks in advance for any advice! :topsy_turvy:

 

I've been seeing this happen as well with only my pokemon blue version with my super gameboy recently today now as well, would like to know why it happens and if it can be fixed.