N900 Central Stops working on file transfer

Hello is anyone else having an issue that when you try to tranfer files the router stops responding?  It has started ever since I had to roll back to the prior version of the firmware.  Anyone have any ideas how to fix this?

If you are near your router during a transfer see if the internal fan is kicking on.  I had all kinds of trouble with my first one until someone suggested sticking a laptop cooling pad underneath it.  Turn out a 5gb file transfer would cause it to overheat and crash.

Thanks will give it a try!