user gets locked out almost every visit

[Chris Bell]

hi everyone,
im having this odd repetitive issue consistently with the same customer,
i have no idea how or what exactly he does; within minutes of visiting the site he gets locked out,
i am unsure what he does in his session or which addons he runs in his Chrome browser,
randomly (a handful per week at least) will get locked out for some (unknown) reason; only with this customer its consistent,

i know first hand this is not a malicious user, he is a friend!

any advice?

TIA
Chris

[IveLeft...]

What do you mean by locked out ?

[Chris Bell]

the system automatically locks users out (no posting or login) based on certain criteria, in this case he must be falling into one,
but no idea why or which criteria is causing him to get locked out

[DesignzShop]

I'd have him clear his browser cache and try again.