Orlandaz
Sounds like you are having session or time discrepancy issues. Make sure your base server timezone is set correctly, make sure your webserver timezone is set correctly, make sure PHP timezone is set correctly, make sure the database timezone is UTC, and for good measure make sure osTicket system default timezone is set correctly. Then set your agent session timeout to a time (in hours) or “0” for 24 hours.
Cheers.