Bluetooth keyboard and mouse problems

Dear friends,

I think something is wrong with my bluetooth devices... They work perfecly well for a period of time (maybe 1 hour, maybe 2 minutes) and after this period they stop working well. They are not disconnected, they keep working, but they are super lagish, e.g. the mouse cannot be controlled, the keyboard have super latency or it keeps repeating a button i selected.

When this occurs I turn off bluetooth from my status bar, and turn it again on right away. That solves the problem for again a period of time. This issue was first introduced to me after I installed Lion on my mac. After this and some other problems I experienced in Lion, I decided to switch back to snow leopard again. The thing is that the problem persisted...

Any suggestions ???

Thanks