Random freezing, sound loss on MVS4 slot

Has anyone encountered an issue where the 4slot freezes randomly? Sometimes the in game sound will go out, and the 2 player left direction goes out as well.

probably some rotten traces or bad soldering joint.
the 2 player left is the pin 78 of the PRO-B0 chip (if your slot is an old 4 slot version)

https://wiki.neogeodev.org/index.php?title=PRO-B0

otherwise if it's a MV4F slot it's the NEO-C1

https://wiki.neogeodev.org/index.php?title=NEO-C1

But moreover than only the inputs side, it can be the data bus connect to the 68K.