Not sure if it's the same problem, but the display on my X randomly becomes completely unresponsive. It happens a several times a day now. Locking and unlocking seems to clear it up. I've tried uninstalling apps and also did a hard reset. The problem persists, so I'm getting a replacement. Ordered at Verizon store last night with ship by date of 8/18.

 

If you think it's Handcent, remove it and see how it goes. Keep us posted.

 

I had the same type of problem however i think mine was more related to the fancy widget app running.

 

I had the same issue and I found keeping the X clean by using history eraser and not having a million texts in my phone elimated the problem. I didn't realize how much I used the internet and my cache file was to big.

 

Motorola recommends shutting down your phone at least once per day. They say this will keep your phone running most efficiently.Of course in your case there may be other factors, such as apis running or signal strength etc.