Apple bluetooth keyboard loose connection

when ever my imac goes to sleep it looses the bluetooth connection with my wireless keyboard (old white style).
As i have password protect set up on the sleep mode this loss of connection is rendering the imac unusable as i can't log into the imac.
The only way i can get the connection back is by forcing a restart on the imac.
Has anyone else experienced this problem or could offer any advice how to remedy this problem?
Regards
Owb

I've just started to experience this strange problem myself.
My mouse will wake up my 24" iMac Aluminium just fine, but if
it has been running in screen saver for a long time, like overnight,
then the keyboard will fail to register with the computer. I'm stuck
with just the mouse so I have to turn the machine off (bad stuff).
I'm running 10.5.1 with the latest software updates. I have the new
wireless bluetooth keyboard (small) and bluetooth mighty mouse.
I really hope there is an answer to this problem!
Thanks,
Mike

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