Wirless Router Always Disconnected after 1 or 2 hours – WGT624

Hi all: I just brought Wirless Router(WGT624), after I setup everything works fine, after 1 or 2 hours the wireless connection disconnected & connected to my neighbor’s wirless network. I used AT&T DSL. I am very frustrated about it. To fix this problem, I unplugged the power of the router, and reconnected to my router.
I read some post about this Router, there are so many problems about it.
1: Should I return it?
Thanks everybody!
2: Which Wirless Router do you guys recommended to use?