WiFi acting out

[Kiedra]

WiFi started acting out at 10 pm (29th July) it’s now 1am (30th July) and still real patchy. I keep getting "there's something wrong on screen" or the screen freezes with the blue turning circle. Used Sky app to test for issues, no known issues.  Unplugged everything, waited a while, then plugged everything back into place. Seems to work ok for a bit, then bam starts acting out. Sky are a nightmare when it comes to stuff like this, from past experience.