I thought it might have something to do with AVG as it coincided with another AVG function being added to my PC.
I contacted AVG who told me that it wasn't anything to do with their product, today I deleted their product and now all is OK!
AVG used to be a good product but now I hate it. I find so many problems with it and when you search online they are always common problems others are also having. Their support is apologetic but useless and they tried to charge me extra for it when uninstalling and reinstalling didn't solve the issue. I have the paid subscription and yet it will only install the free with ads on my phone.