[....] Also it seems anything remotely CPU intensive just shuts off such as the youtube app that doesn't work very well either
It is not "cpu intensive" that is the problem.
Archos made a device with too little memory. When the operating system cannot satisfy a memory request, it goes "splat".
In desperation, use the "monitor" app which is one of the standard applications and kill off absolutely every service. It tells you how much memory is available. Then try your program like Angry Birds.
The sad thing is, you cannot increase the swap space - maybe apps that would need to swap would run too slowly.
I guess archos knew this when they sold the device. They cannot claim to be surprised "oh merd, il ne functioniert pas!".