A 2 second drop out is crazy. You should be getting at most a little dip of the lights, which should last 0.1 or so seconds. Anything as long as 2 seconds should be considered as an electrical problem.
I've had a DG834g router before for around 2 years. I very often had several months of uptime without a single reboot required or occuring... I would say the PSU might be faulty but if the powers actually dipping for 2 full seconds you should be trying to get that resolved.
If the dips are only really quick 0.1 second or so ones, usually so quick you just think you've blinked then get a new PSU as mine definitely never did this.
Or even better get a nice N router.
Edited by ukhardy07 (Tue 07-Aug-12 19:55:54)