Not been an issue previously as I've got the box ticked to keep me logged in but doesn't matter what device I use I still have to log in. Something changed I don't know about?
Your browser is losing its cookies. Either you told it to not keep cookies, you are Private Browsing , or it has decided that TLB is a seething mass of evil because it doesnt use a security certificate and should be dumped into the depths .. Or your device or wifi has been hijacked and they are gathering all the password in case you logon to your Barclays Wealth account.. Buy it a nice pack of cookies next time you go shopping.
@Dicky Your browser is losing its cookies! I think Mike has met you and is typing that in a Wallace and gromit voice