Why does my nonwireless keyboard stop functioning out of the blue?

Quad 2.5 10.4.6
keyboard works on my other G5
when i restart it works
why does it stop working about once a month out of the blue
cant type etc unless i restart
repaired perms and first aide ok
everything else seems fine
??? ?? ?? ????

I was just about to post a similar thing, but mines alittle more bizaar. I can type in safari and firefox but not in the search bar in the finder or to rename a folder. Using dual 2.3 , X 10.4.5?????

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    Edit  
    Delete
    mary gronenthal   2 hours ago
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