RBK40 Download Speed Slows Down After 5 Days

1.) FW version (2.1.4.16)

2.) Arris Surfboard SB6183 Modem-If I hook up directly to the modem I get my full download speed. After I saw my speed slow down on the router I hooked my computer directly to the modem to see if the problem was coming from my isp. 

3.) Home Square Feet= 2107

4.) Both satellites are almost exactly 30 feet from the router. My satellites are not affected..I'm only seeing the speeds slow down on the router on the 5th day after I reboot everything. It happens on the 5th day every time..If I reboot the system the speeds go back to over 200mbps for another 5 days.

5.) My channels are set to auto. I downloaded Netspot and none of my neighbors are on the same channel as me. I have 2 houses nearby.

6.) I've already tried disabling those options but it did not affect anything. 

7.) My speeds are tested wireless.I get over 200mbps wirelessly until the fifth day and then anything connected to the router will drop to about 40mbps..Anything connected to the satillites after the fifth day will continue to see speeds over 200mbps wirelessly. After I reboot the speeds on the router will go back to over 200mbps wirelessly.

8.) There has not been a firmware update since I bought the system that I'm aware of.

I'm going to try clearing the logs next time my speeds slow down again per a suggestion from another person on this thread.