Hi!
Are all the discs scratch free? Could it be that the (Mario Party and Wii Sports) discs are scratched/damaged?
If the laser is weak it could have issues reading the discs…
In that case it’s for the best to replace the laser. Or you can bring it to a repair shop which can repair the discs (make it scratch free with polarizing).
Can you share some photo’s regarding the state of the discs? Thanks!