kbin logging itself out all the time

I am always being logged out of kbin on desktop and mobile PWA.

On desktop, using firefox, if I stop using the site for 10-20 minutes, even if the active tab is open with it, I am logged out. Is this normal expected behavior or might I have some setting or addon which is creating this?

I have given kbin an exception to the rule of purging cookies between sessions in case somehow that was the issue. No change.

Never encountered this before.

Anyone else with same issue? Or no?