EA4500 unresponsive while transferring large files

I got a refurbished EA4500 (directly from Cisco) last week. I have been having a few issues, which I have found (not too great) workarounds for. However, the latest issue has me stumped, and is unacceptable.
Whenever I am transferring files between 2 computers, I get kind of OK speed (5 MB/s). However, while this transfer happens, no other device can connect to the net. Actually, even trying to go to router home page (192.168.1.1) times out.
The clients still say they are connected to the router, but I just can't get anywhere.
As soon as the file transfer finishes, everything goes back to normal.
EA4500 replaced a WRT54G. Never had any problems with that router. It was such a workhorse. Just needed to upgrade to a n-router.
I am on the latest non-cloud firmware.
I have reduced the MTU size to 1200. Not sure that matters.
Thanks in advance.

gabhroo wrote:
I think I figured it out.
I have EA4500 running in N-only mode.
I have WRT54G connected to it and running in G-only mode.
I was transferring files between:
* Desktop A - Wired to EA4500
* Desktop B - n-Wireless (EA4500)
I was testing internet on 2 laptops, both of which are g-only (older laptops) and connected to WRT54G.
Today morning, I tested this setup again, but tested internet on my phone (n-Wifi). It worked just fine.
Then, I tried to ping WRT54G from my laptops (during file transfer). The request timed out.
So, I am guessing it is more of a 2.4ghz conflict. I had already ordered n-wifi usb adapters for my laptops. I should be getting that today.
However, I still have my mom's laptop and a old wireless printer, which will be on 802.11g.
Should I:
a) Just live with it, since there is only 1 or 2 devices?
b) Just turn off the wireless on WRT54G (still need extra wired ports) and turn on b/g/n on EA4500? I had read somewhere that EA4500 will perform better if it works in n-only mode (but I did not really read the technical details at that time). I had also taken this approach because I was trying to troubleshoot frequent disconnects on my Android devices (which I could not figure out, but got a wifi fixer app, which keeps reconnecting).
Any other creative ideas?
I recommend choosing "b". It is better to turn off the wireless of the WRT54G so that it would not create interference with the EA4500 specially that they are on the same location. For the EA4500 you set it to Mixed Mode and just do changes on the wireless settings to make it a stable connection. By the way are you using the classic firmware or the cloud one?

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*All commands, path/file names and configuration directives are CaSe SeNsItIvE*
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Have fun!
G4 Quick Silver 2002 800 Mhz Mac OS X (10.4.7)
G4 Quick Silver 2002 800 Mhz Mac OS X (10.4.7)
G4 Quick Silver 2002 800 Mhz Mac OS X (10.4.7)

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