This has been driving me nuts for weeks, every once in a while this happens for weeks on end. Comcast has said sometimes when people call it triggers the vm even when they dont leave one, but no one is calling me at 2 am. its very annoying. Last time they "reset" it for me, I lost a bunch of very important voicemails about work, which cost me money. there has to be a way for them to fix this other than completely deleting all of my voice mail i have already heard. I call myself and leave a message to clear it, but its such a pain every day, sometimes a few times a day to keep doing this.
Did you ever get this resolved. For the last couple of months my indicator light has been coming on in the middle of the night. I can clear it just be confirming there are no new messages, but this is really annoying. This is the ultimate in crying wolf. If you can't trust it you start to ignore it, which I would if the light didn't light up my bedroom all night.