Bluetooth stops working now and then

My bluetooth stops working now and then. Let's say I haven't used bluetooth for a few hours and I want to sync my mobile phone. I try, but it's unable to connect. If I then try to turn off Bluetooth, I'm unable to turn it back on. In Bluetooth preferences, the status will be 'Off' and the 'Turn Bluetooth On' button is greyed out. The only way to get Bluetooth working again, is to restart OS X.
Help!

1. Boot from your system CD, run Disk First Aid and repair your permissions.
2. Then try running it with Airport turned off.
3. Reinstall the original RAM and run it that way for awhile.
-Bmer
Mac Owners Support Group
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