Help Multiple "Not Responding" Messages

I used to be the proud owner of my HTC Sensation -- until I got suckered into the ICS upgrade, which turned out to be a downgrade of the severest proportions.

I upgraded in 2012 and have had the system repeatedly crash ever since. The latest problem is that I am now getting multiple messages popping up saying that "XXXXX" is not responding, click to close, wait or send report.

The X's represent the name of individual apps and I get one such message after another. When I click to close, another pop-up will appear and say the same thing with another program, and so on and so on.

I'm about to do a factory reset for about the 4th time since the ICS upgrade, unless someone might have a better course of action for me to try.

Thanks much!