Hotspot users need to relgin after reboot mikroutik router

Hello,

I have rb110 and I am using usermanager and hotspot only.
All users can get login page and they can login and everything work well.
But if I reboot mikrotik router.
They must relogin again every time i restart mikrotik router.
How can I make mikrotik router keep them connected after I restart router ?

Really need help …