Unable to access some sites after factory reset on XR500

[Piplowe]

Hi,

Since factory resetting the XR500 I can no longer access the BBC Sport or news website.  
If I enter the url or search on google and click the results link I get the same error. ERR_CONNECTION_CLOSED

If I connect to the main talk talk router I can access BBC and if I connect to a VPN on the same pc the XR500 is connected to it works. 
Oddly if I connect the VPN navigate to BBC and let the page load, I can disconnect the VPN and browse as normally. 

I've tried the default where I get the DNS from the main router and I've tried manually adding a few. Such as 8.8.8.8 and 1.1.1.1 

It's a strange bug as it only affects a some sites.  

Ad Blocker is not enabled 

Any thoughts?  

[Netduma Fraser]

Could you try disabling QoS entirely from the Congestion Control menu  and see if it still happens please?