Help Milestone Call problems


My milestone is running TheFroyoMod v2.9.2 rom and has been working fine for the past few months.
Today when I tried to make a call I get no call sound and the microphone doesn't work either.

Doesn't work when switching to speaker phone. It's just complete silence but it registers as the call connecting.

Any ideas?

Tried reflashing TheFroyoMod, but to no avail.
Am I more likely to have a hardware problem?

Edit:- Just did another reboot and it's working now. Hmm Never mind. I'll report back if it happens again.