Internet disconnection after a period of connection

Hello good time
i install mikrotik operating system
And run pptp server and l2tp server
When I connect to the server via pptp or l2tp connection protocol the internet stops after a while
This also happens on mobile phones
how i can fix this problem ?
thanks

Check the PPP profile used by your PPTP and L2TP servers. Adjust “session-timeout” and “idle-timeout”.

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this is my pptp and l2tp profile





in windows pc i don’t have this problem

just android device have this issue
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