I have a "little" problem with all my microtik devices (6 RB750 and 3 RB750G)... we have configured as basic hotspot (with login and pass embeded into the html code, so user only see the condition of use... and accept it)... well, all is ok...for several days, but after some time, the system doesnt work... it show the login page, you accept....and again login page, i have to enter using the wan interface (it has no hotspot login)... and restore the file configuration (restore a backup)... and all is working again for several days... after several days (doesnt matter if i restart or not the system)... the same problem... and again restoring the same configuration file...and again ok

this trouble is general for all devices (some of them (RB750G) the space between "reconfigurations" is bigger... several months... but again after some time.... the same.

I have changed firmware, RouterOS versions (from 4 to 5)... but same problem.

what do you see in the log when the user clicks accept? you should see the attempt to login. does it pass or fail?