I've been having the same issues ever since i've updated it to the newest firmware (1.34NA).
I started off with 1.11, which was working very well.
I saw that 1.21 had shareport so I updated to that last year. And it worked pretty well.
Later 1.31 was released, so I updated my firmware to that. That's when things started to go wrong. I started to get really slow speeds on my PC (Windows XP) which uses an DWA-655.
The instant I saw updates on the firmware I started to update it, so now I'm at 1.34NA. However not only am I getting slow speeds, I'm getting random reboots which is REALLY annoying when I'm downloading something or playing games.
I've read that other people have been getting the same issue since they have updated to 1.3X. Is there a solution to this or would it be possible to get an RMA?