Serious wifi problems with iMac after installing Mountain Lion

After installing Mountain Lion, I'm experiencing serious trouble with wifi. I noticed that some people had this before with Lion. Can anybody help to solve this problem or should I downgrade to Mountain Lion?
Please help
Thanks in advance!

Thank you for the information Arizonadonn! I'll install 10.8.1 this evening. I really hope you're right after having connection troubles for almost a month now .
If this solves my problem, you'll be my hero !

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