Jerome,

Obviously not all have this problem... and as Matyas pointed out his router works too if N800 is the only device connected to it. When I did read through this thread I got into understanding that whoever had this router reboot problem was fixed by turning off (or changing...) the power saving setting in N800. Therefore it looks like the problem is related to the power saving mode.

The documents I linked give little bit more information how this mode (PSM) works. In AP standpoint the only real difference is that AP needs to store packets in its internal memory when N800 is in sleep state, and send them as a burst once N800 become awake. Depending how much the AP has internal memory for this operation, it could be that with lots of traffic and long sleep time (long Beacon interval) the AP may run out of its internal buffer memory. Then depending on the AP hardware/software implementation, the "buffer overflow" may trigger an Interrupt for its CPU to call Reset vector...

The sleep time can be changed by changing the beacon interval in the router. If someone can try to change that value to see if shortening the beacon time solve the problem, or lengthening it makes it worse... If so, then the out of memory explanation should make sense? No?