Mine does that too, but no reboots.

Also, it sometimes goes completely nuts if, while it does this, another call comes in. CPU is pushed to 100%, phone becomes very hard to use and the conversation is chopped up, sometimes a little, sometimes I can't understand anything.

I had to disable it to make a few calls today.

Right now, if I want to be able to make a phone call I have to reboot after each call via power button.

ETA:

Oh, and I know I'm not going to be able to talk when it takes 5 seconds for the notification to pop up. Usually it's pretty fast but sometimes it takes maybe 10 seconds for the "pick up call" to appear.