Hello john
Try cleaning the cartridge and the cartridge slot. I have fixed
these things for years. I am opening up a parts shop on the web.
http://www.vgr-techs.com. Check it out. Please tell others.
If this doesn't fix the problem. I will be glad to repair it for you.
This will include cleaning of all games and replacement of anything
that went bad for $25.00. Nintendo charges $60.00 for the same
service. I use the same techniques as they do. Let me know what's
going on.