Port forwarding stops working several hours after reset

I have a WRT350N (fw v. 1.03.2).  It's connected to an Alcatel ADSL modem (PPPoE configuration).  I've configured port forwarding to allow HTTP and SSH into a linux box on my home network (static IP).  I am able to get to the linux box from outside for the first few hours after I set up the configuration, but a few hours later I am no longer able to get to it from outside - port forwarding stops working though the settings remain as I'd left them.  Over the course of various attempts I've had the external connections just die (404 errors, host not found, etc) and sometimes the connection went to the router - getting the WRT350N login prompt (remote management is turned on, but on port 8080, not 80, so this was unexpected).
The only way I've found to resolve this is to reset to factory defaults and reconfigure.  Then it works again for a few hours and shortly is again not forwarding.  I've tried other ports (VNC, RDC, telnet, SMTP) and the forwarding stops working on all ports at the same time.  My home machines are able to get out to the internet with no problems.
I thought the router had a hardware flaw so i replaced it with an identical model yesterday, and sure enough, today I'm again stuck without external access to my home website.
Any thoughts or suggestions would be welcome.
Thanks,
Nick

I was able to trace the problem to torrent downloads.  It seems the router wasn't handling all the concurrent connections when handling torrents.  I haven't had problems since i stopped downloading torrent files.  I did add a static port mapping and configured utorrent to run on a single port on a machine with a static address but haven't had cause to download any torrent files since then, so i don't know if that will fix the problem.
That being said, i've had no issues since i stopped the torrents.
HTH
Nick

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