R6700v3 firmware after 1.0.3.66 slows download speeds by a lot.

[AddToCartED]

I have the Nighthawk r6700v3. At firmware version v1.0.3.66 my download speeds are what they should be at which is 450mbps down avg. When I update the firmware to v1.0.4.78 the download speeds are cut in half to 200mbps down avg. When I update to v1.0.4.82 up to the current v1.0.4.106 my downspeeds are reduced further to 150mbps down avg. Is anyone else experiencing this? Is there a setting I need to adjust the download speeds? It seems like something it limiting the download speed. I can confirm I do not QoS enabled nor do I have traffice meter on. 

[plemans]

When you change firmware, do you factory reset and do a clean install? (not installing from backup)

[AddToCartED]

I'll give that a shot. I did a factory reset when I acquired the router and did the auto update and noticed the reduced speeds. So I went to the download support site and downloaded all the versions and installed the chk going backwards. But I did not factory reset each time. 

[gwaterfallen]

So I updated to v.106 and my speed was cut in half did a factor reset and new install and same thing speed is still slow weather wired or wirless thinking its time for a different router