Need help with Wii system disk reading errors?

Last week I started my console the first time that day and put in Bully: Scholarship Edition. Only a few minutes into the game, I could hear the Wii making sounds like it does when it's been left on too long. I turned it on it's side so the disk would be facing up. It became a little more quiet, but it was still bugging out. I paused it, took the game out, cleaned it off, then put it back in. It glitched up so I restarted. When the console tried reading the disk I got a black error screen telling me to take out the disk and restart the Wii. This happened a few times and I gave up. Today I tried it with Final Fantasy for the Gamecube and I got the same error three times. Since then I've been getting another error that says that it's unable to read the disk. I haven't notice any issues besides not being able to read the disks.