I'm coming in a bit late to the party here, but it seems logical to hang a scope or meter on the homeswitch lines just to see if there's any crosstalk or funny stuff going on there.
You can look at the inputs using the FKEYBIT utility depending on which pins they're on - so you can determine if the computer is seeing a signal as consistently one state or flickering.
Can't rule out software of course, but best to first check the wires. |