Bluetooooooooooth keyboard lagging / spontaneous key repeat

I have a 24in 2.4GHHHHHz iMac w/ 1gb rammmm. Recently my aluminum bluetooth keyboard has started lagging badly (up to 2-5 seconds betweennn key press and characterrr showing up on screen). In addition, it randomly repeats characters that I type (and no, I'm not holding the keys ddown).
I've seen posts on this topic before. I have performed thee 2008 keyboard firmware upgrade but still have the problem.
I have tried:
re-pairing iMac and dkeybooard
restarting iMac
replacing batteries
sometimes a solution will help for a few minutes (things operate as expected) then the problem resurfaces.
Please heelp!

Hello d:
Offhand, I would suspect a failing keyboard.
You could try a couple of easy things before you take it in for evaluation.
Trash a preference file (com.apple.bluetooth.plist) and restart (probably will not do anything).
Rest the PRAM:
http://support.apple.com/kb/HT1379
Barry

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