one day an assortment of issues came up with my PC-10, particularly games that would reset or freeze then reset, exhibit typical NES style glitches, etc.
the solution I came up with...?
I popped each IC out of the game carts, straightened legs, reseated them, etc. used compressed air too. put it all back together and it was all good after that.
do the slot order switch first. take the first game, drop it in the last slot, and just reverse the order on the rest. see if the same slots are affected or if the same games are.
I had some games act up in one slot and then work fine in another. maybe your slots are dirty too. compressed air, it helps. my compressed air disclaimer: always clear the nozzle by spraying the can away from whatever you're trying to clean. never shake the can, and always hold it upright.
