Car Mode suddenly appeared - why? And how do I get rid of it?

About 2 1/2 hrs ago, I plugged in my HTC Evo 4G to its home charger to charge up a bit before leaving the house. It's rooted running CyanogenMod-7.1.0-Supersonic (for at least a month if not more, I can't remember when my husband did this). Within about 3 minutes, my phone had this really weird user interface I have never seen. It's Car Mode. I couldn't exit out of it, couldn't make my phone respond to me at all. I immediately pulled out the battery & rebooted, thinking maybe it was malware. It booted back into Car Mode, only this time I could click an Exit button. Researching, I see that this is an UI for car docking. Only I have no car dock, and it was plugged into my home wall charger. I left the house for errands, and no matter what I did - on the phone on a voice call, typing email (at a doctor's office, not driving ;) ), and it kept booting me into Car Mode. On the voice call it automatically put me on speaker. I did not ask for this program, did not download anything, did not approve anything... I ran Lookout and no Malware or Spyware is showing. I am very confused. Anyone have ideas on what this program is, how it all of a sudden appeared on my phone, and how to get it off? I looked up apps in Google Play and the icon in the notifications bar (when I exit Car Mode) is not something that is there. It looks like an app, but it's not in my Apps manager, either, or a running process that I can tell, yet it is showing up intermittently in my notifications, even not plugged in or moving. It's also turning on intermittently. I can't get anything done. Thanks for any help!