Support Unable to Make/Receive Calls

So I've had a really annoying issue lately with my eris. I cannot make phone calls sometimes during the day. I've found that I have to pull the battery twice in a row to get it working again. I am currently running the Gingerbread custom rom for the eris, it happened before when I was running a custon 2.2 rom. This is incredibly annoying because I can't rely on my phone to make a call right now. Does anyone have any idea?