Nokia 7 Plus running apps via WiFi issues

invalid@example.com (DebiH2004), DebiH2004
Thu, 24 Jan 2019 21:42:02 +0000
Nokia 7 Plus

Hi.
I've a Nokia 7 Plus running Android 8.1
Since buying this phone new 6 weeks ago I've been having problems running several apps....and this site, via WiFi. I receive a white page can't load/no connection message and even though there's no problems with connection the only way phone will display the webpages in to turn WiFi off and proceed on 4g. The Amazon shopping app was first to bring the problem up and since then there's been many times I'm having to use 4g rather than WiFi. Ok my 4g...