The X-ray handswitch and footswitch on your OEC 9800 are subject to a lot of wear and tear: being dropped, getting stomped on, having their cables run over. There's a pretty good chance that, over the lifetime of your C-arm, you'll have a malfunction from one or the other at least once.
Some of these problems can be diagnosed and repaired. Others, might simply require a total replacement. The video below will give you a brief overview of what proper functionality looks like, what some common problems with hand/footswitches are, and where you should look to find the causes of these problems.