Bluetooth turns off, needs restart to come back on

I'm using a 17" Imac G5 w/ power pc processor, no isight. It came with bluetooth installed at the factory. Software is 10.4.11. I recently bought a new wireless aluminum keyboard and wireless mighty mouse (on ebay, boxes were sealed). They worked fine for the first month or so. Now, they started randomly losing connection, but not really when I am using them. It seems that when the screen saver comes on it causes the issue.
I'll go to the bluetooth set up page both trough system prefs, or through the bluetooth icon in the upper right, so I can rediscover them, or delete them and pair again. However, when I click to add new device, both after having deleted them and without, and it gives me a message that bluetooth needs to be turned on. So I click the option to turn it on, and nothing happens. When I go back to the settings for bluetooth in the prefs menu, it confirms that bluetooth is off, and the button next to the status text to turn it on is greyed out and can't be clicked.
The only way I can get bluetooth to come back on is to start the computer. I'm really just guessing about the screen saver activating it. Usually the screen saver comes on because I've gotten up for a while. When I think about it, if I'm still sitting by the computer when it goes to screen saver, and I start using it again quickly, the mouse and keyboard work fine.
I'm really fed up with it, it seems a lot of people are having similar issues. I use this computer as a living room internet browser, so I really need the flexibility of the wireless so it can be used from the couch (its on an end table and not a desk). If anybody has any good suggestions, please let me know. I'm confident that the issue is not with the keyboard or mouse, because when they stop working, system prefs always shows me that bluetooth is off. Why does it keep turning off! Why? Why won't it let me turn it back on again, why?

http://osxdaily.com/2013/09/19/ios-7-battery-life-fix/
http://www.apple.com/batteries/iphone.html

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