If you go to this website on a different gadget, maybe on a tablet then on a computer that will ask you to sign in each time, or it does with me.

It might be something to do with cookies. Cookies contain information about the sites you visit, so if you have deleted them then the site won't know it's you.

Check that your computer is set to "Enable Cookies".

Thanks, I'll check that out.

You use an iPad don't you?
Your iPad will log you off if you break the Internet connection by having wifi and mobile both switched off at the same time.

Make sure that you tick "remember me" on the GoY log in screen.

I'm on a lap top and it does the same to me. All of a sudden started doing it about 4 months ago and it drives me mad. Have to log back in every time i come out of this site despite ticking the "remember me" box.

That happens to me and yes it drives me crazy, bit like the disappearing comments, never have discovered why it does that either but often happens if the baby Iciar avatar pops up, crossed wires somewhere and something that has been happening on/off for quite a number of years now.
Last week I tried four times to reply to a PM only to have them all disappear into the void, the next morning I tried again and was successful on the first attempt, I apologized to the member in case all of them appeared in their inbox but nope only the one got through .....Delightful gremlins, only amusing if one has a lot of patience...

Thanks again people. I've tried every suggestion but again this morning - guess what - sign in first !