I found a post on another forum regarding this same problem on an Archos 5. Here's a post that seems to explain a workaround for this problem:
Low memory conditions do crazy things with Android on the 5A. Poor memory management yielding: Increased Response time, Extended Slowdowns, Freezing, Reboot, and the like.
To make this even worse, the Android Archos 5 usually gives us no warning. What to do!?!
Turn on Settings>Sound & display>Audible selection
Then you get a "click" each time you tap a screen selection.
The Warning: Not Hearing the Click After a Tap
The Action: Wait until you hear the tap "click".
As Android matures with better memory management this will go away. Maybe Google with fix it this year, especially if Android devices get more market penetration.
I'd give this a shot and see if you end up seeing this error less frequently. The whole thread makes it sound like these Archos devices have issues with memory management, leading to a crash when the RAM gets full.