when timer expired raised an unhandled exception

I have 2 10g forms that runs continuousely. They are display screens of scheduled open work, that refreshes

as it scrolls. The scrolling is based on a timer, and when it reaches the last record, the forms requeries, and

continues on scrollling.

My problem is every few days, both screens that are connected to different PC, stall and stop working

we have to manually restart the PCs and the screens work again for few days and the problem happens again

The message we are getting:

end of communication channel, and at the status bar we get: when timer expired raised an undandled exception