I make sure I get the 'any kind of connection cookie' in (see Getting Logged Out thread) and now do not get random log outs. I generally use the https connection to make linked images etc work properly.
On my laptop, because it is protected with a PIN and I am sole user, I let Chrome or Edge save my BHF user name and password so in the rare event of a log out I only need a mouse click to re- log-on with no keyboard typing needed.
Don't use this if you are not the sole user of your laptop !