Since the upgrade to Android 4.0, I have issues pl...

From time to time, when I dial a number and press call nothing happens. For instance today I tried placing a call several time and it didn't work. I restarted my phone and had the same trouble. I IM'ed the person to call when. When they did, then my phone tried to call them as well. This is a huge problem. What good is a phone that doesn't make calls?

I was "upgraded" to ICS on 2/9/2013. I have an HTC Thunderbolt.