S10 not auto reconnect to wifi

Hi to all.
I'm using a Samsung S10, ver 10.
It's a strange one.
If I go out of the house, even to the garden, I lose my wifi signal, which is fair enough.
When I go back into the house it shows a full wifi signal at the top.
I look in settings and it says connected.
(Sometimes it says connected without wifi)
But it's not connected because I can't connect to internet with browser.
I've got it set to automatically reconnect.
I have to go to settings, turn off the wifi and turn it back on.
Then I'm OK unless I leave the house.
My wife doesn't have the problem with her phone, and my 2 computers and Google Home speakers are ok.
It's annoying because I end up forgetting, then find I've missed several Whatsapps once I remember to turn wifi off/on.
Any ideas?
Is there a way I can reset the phone wifi settings?
Or something?
Thanks for any help you can give.
Paul

 

Thanks for the reply.
Done that many times.
Virgin Hub 3.
Unplugged it for 30 seconds.
Also pressed reset button.
Still same.
Only started a couple of weeks ago?
Paul
Forgot to say it's not rooted.