Need help with my E2100L Wireless Router

I moved back home with the parents after graduating from college while I'm searching for a job and I noticed my parent's wireless internet connection was really poor. I'm normally pretty decent with computers but I haven’t been able to fix this problem so I am hoping if I explain it to you fine folks and can point me in the right direction to getting everything running properly.
The problem I’m having is with the wireless signal fluctuating frequently when I’m not in the same room with the router. I know the issue is not with Comcast or the modem because when I remove the router and just plug into the modem I get 25 Mbps all day long when I run a test on Speedtest.net.
The setup is Comcast Internet 25 Mbps, SB6120 Modem, and Linksys E2100L Wireless Router with WPA2/WPA security activated.
Before I touched anything the modem and router were originally in my parent’s bedroom. I was getting speeds of less than 1 Mbps if any when I was in my bedroom so I moved them into the living room to be more centrally located. Our house is a one story house with bedrooms divided by the living room. The move seemed to help a little but something was still really wrong so I did a hard reset on the router. I setup up the network manually by going through the settings on 192.168.1.1. which made things work a little better. However I still wasn’t getting close to the speeds I should have been getting and when in my bedroom the connection would sometimes drop out altogether. So I did another hard reset on the router and this time I used the CD that came with it (Cisco Connect) to setup the network. That has got my problem halfway fixed because now if I am in the living room and my laptop is connected wirelessly when I run the speed test I get 25 Mbps.
I thought I have solved everything because in my bedroom the signal was now very good at 20 Mbps… except the 20 Mbps didn’t last. It held around 20 Mbps for the about first 10 minutes but then dropped to about 16 Mbps for a while. A day later when I run the test I now range anywhere from 3 Mbps to 14 Mbps. There seems to be no consistency. I did a hard reset again and setup the network using the CD and the problem persists. I get 20 Mbps in the very beginning and then it lowers from there and fluctuates frequently.
I thought it might be a firmware issue so I successfully updated it today to the latest firmware “1.0.05 build 4 Mar 8, 2012” but the same thing happens. I just don’t get it. Why am I able to get 20 Mbps for the first few min in my bedroom and then it’s a crapshoot thereafter?  If it were interference wouldn’t the interference always be there and not be a gradual onset? Why when I’m in the living room with the router is it perfect at 25 Mbps but as soon as I go to my bedroom I get a much much lower connection speed.
I could handle the speed being lower if it was consistent but it’s not. This post has taken me about 20 min to type and while doing so I ran the test a few times at a couple minutes apart and got 3 Mbps, 7 Mbps, and 10 Mbps speeds. Someone please help! This is driving me crazy!!!

When in my bedroom there are only 2 other networks available to join that belong to neighbors but their signal strength is fair at best while my signal dances between being excellent and good. There is no microwave oven, cordless phone, or garage between me and the router. When I'm in my bedroom I'm no more than 10 feet from the actual router and only seperated by a wall and I'm pretty sure its not a brick wall.
Again I don't understand how it could be interference. If there was something interfering wouldn't it always be interfering? Like I said in my first post every time I reset the network I get speeds of 20 Mbps for the first few min in my bedroom and then it gradually lowers and I get a fluctuating speed between 3 and 14 Mbps.
In the settings there is no channel width option of 40 MHz only. I get "20 MHz only" and "Auto(20MHz or 40MHz)" as my options. I have tried them both but don't really notice a difference.
I am going to try the insider program today to see what its results are.

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