320N Freezes when trying to transfer data over wifi

Question

I have the 320N and I am very frusterated.  I would just take it back, but I bought it brand new on Amazon.com, meaning I will have to pay shipping because I threw out the box and the return shipping form for RMA's!  I don't even know if Amazon will take it back without that paperwork, but anyway here's the issue...
I don't have any N cards yet, but I upgraded to this router because my home internet service is faster than what my older WRT-54g could route.  This new router does route and I can now achieve the rated speeds of my ISP (50/10 mbps). 
I can transfer large files 6+ GB WIRED between any of the LAN ports on this device.  However if I try to transfer much data over wifi, the router will simply stop working.  The lights on the front work fine, they blink like there is activity, and the power LED is solid, but it won't pass traffic and the wifi SSID dissapears.  I run a constant ping to the router (ping -t 192.168.1.1) and I get <1ms replies.  On my laptop I initiate a download of a 1GB file which is shared in my windows 7 homegroup.  Within a minute or two the constant ping to the router starts timing out.  Internet access to anything (wired or wireless) instantly ceases.  New introduced devices will not grab a DHCP address.  Existing PC's whom already have their DHCP address can talk to each other only if wired.  The wireless transmitter stops broadcasting the network and devices no longer see it on the airwaves.  The only way to fix it is to power cycle it.
It doesn't even have to be a large file over wifi to transfer.  Just now as I'm typing this post I noticed the constant ping on my other monitor started timing out.  I power cycled the router in time for me to submit this post.  In fact I had to do it three times in the time it took me to write this post.  This is the most frustrating experience I've had with any wifi ap/router, and I play with Cisco gear at work that run real IOS.
Here's what I tried so far.
Reset factory defaults by holding in the rear reset button for over 30 seconds.
I can confirm this resets the defaults as the password and all other settings are back to default.
I tried WPA2 Personal.  I tried WPA.  Router still freezes.
I tried it with just the default settings.  Router still freezes.
I've reset the router numerous times.  Still freezes.
Power cycle it for more than a minute.  Still freezes.
Reflash it with Linksys's latest firmware.  Still freezes.
What do I do next?  I have a feeling it's the same problem as in a lot of the HP Printer firmware boards.  That problem is poor solder joints on the BGA processor connection.  To fix that you put the formatter board in an oven at 400 degrees for 5 to 8 minutes.  After that time you just let it cool to room temperature.  The oven heats the poor solder joints enough so that it reseats and gets a better connection.  There are hundreds of posts of success on this.  I also hear that the solder connection problem exists for many of the older revision Xbox 360 game consoles causing the infamous "Red Ring of Death".
So do I try to fight with Amazon to take this back and eat the shipping?
Do I void my warranty, open the device up and put the board in the oven?
Do I buy another router from a closer store, but then put this one in the box and take it back?
Do I just cut my losses?
Do I just use this as a wired router (disable Wifi) and hook up my WRT-54g and make that act as just an access point?
Thanks for the advice. 
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Answer 1

Ok I've had my replacement 320N for almost 1 full week now, and while at first it was fine, come Sunday it appears to freeze during heavy transfers.  I was streaming an HD movie to the laptop connected to the TV.  3/4ths of the way through the movie it started skipping.  What do you know, the whole network was down.  No internet or anything.  Power cycle the router and everything was back up.  Needless to say, I finished the movie through the wired connection.  The next day I tried copying 8GB of data wirelessly.  The SSID vanished 1/3rd of the way in during the transfer.
What is wrong with this stuff?  Linksys doesn't make things like they used to.  This 320N is so cheaply made I don't think I could recommend it to anyone.  I might see if I can send this back to Amazon and get a Netgear.