MacBook USB not working properly

I think my UBS ports are starting to.. I don't know seems like they are starting to give out, sometimes its the left one sometimes the right one. I have Google'd this problem and lots of people seem to have similar problems, but not quite. It's like sometimes they work great and have no problem the whole day or even week. But lately it's happening more & more... so if anyone could help out, would be great.
Thanks.
MacBook 4,1
2.1 Core 2 Duo
4 GB 667 MHz DDR2
With (10.7.2) Lion

I have a Macbook pro 15 inch, early 2011 with the exact same problem. Also tried resetting the SMC as well as the PRAM, but it doesn't work. It was a rare problem from the beginning but now it's happening all the time and now it's very unusual having both ports working at the same time. It doesn't matter wich devices or cables I use. One of the ports suddenly just dies, never both at the same time. A reboot usually fixes this but after a while it will happen again. Sometimes one of the ports is already dead on startup.
Could this be a hardware problem?

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Quote from: Bas on 19-November-10, 22:57:34
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