XF 2.2 Users get logged out when clicking home/logo


I've got now multiple users reporting that when they click Home or the site logo that they are logged out automatically. I cannot reproduce it myself, so it's hard to get a grip on what's going on. But of course, my admin account is 2FA where a regular user's is not, and it may be browser related or even because they are on a phone (I only have a laptop with internet).
Any clues as to what it could be?
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