Odd behaviour - a few web sites, a few devices, Plus Net connections

[#1]

OK, so my phone is a Galaxy A3 2015, running stock MM, Plus net FTTC and a TP Link Router with latest firmware.

One of the thes site is the UK Huffpost site. (m.huffpost.com/uk)

If I clear all the Chrome data it works once. Then fauils with ERR_EMPTY_RESPONSE. If I load any other browser, it too wil work once (without having to clear Chrome data) then fail. 

This is ONLY on my home network using a TP-Link Archer C2 router - Mobile network and other routers are fine - HOWEVER I have this issue at my mother-in-law's, who is also a Plus Net customer (old school ADSL)

If I use any other device on this router it too is fine.

What is going on? What "data" am I clearing in Chrome on the phone that makes it work again for other browsers (if this was a PC I would flush my DNS, but I don't think that is it here)

So, as a common factor is Plus Net network I am posting here, to see if anyone has any ideas?

Many thanks

[#2]

That certainly sounds odd and with it only happening on one device, would suggest that device is the issue really. Have you tried the Galaxy help forums on that error?

[#3]

I did post to xda but nothing. However I have installed custom lineage is and it works, although the huffpost site is now failing to recognize browser agent and always presents desktop site.