ppoe login problem

Hi everyone,
I’m new in Mikrotik RB
Just I configure my RB750
as Hotspot and PPPoE with User Manager.
Now I’ve problem with Lan User.
My Lan User are connect like RB750>>>>Switch>>>>>UBNT NS Loco M2>>>Point2Point>>>>UBNT NS Loco M2>>>>Switch>>>>>>User

Some times my Point2Point device are restart. then My Lan User cant use Hotspot page also PPPoE

Now This How can I solve it.

Help me