Keep Dropping Out of Forum Sign-in

Hi Guys

I'm not sure this is the right forum but if someone could redirect, I'd appreciate it. Ever since the Forum website was update a while ago I keep intermittently dropping out of sign-in. It is very frustrating when I'm half way through writing a thread and suddenly I've dropped out to the sign-in screen. Even more bizarre, when I sign-in again, instead of being directed back to the page I was on I get a page error, saying the page I want doesn't exist. It happens on my laptop and PC. It seems to be worse if I click to "start a new thread" when reading a thread, rather that by clicking create at the top right of the page.

Any ideas on who I should raise this with and how would be welcome.

Regards,

Graham