:local PPPInter "ppp-out1";
:local count 0;


:if ([/ping 8.8.8.8 count=5] = 0) \ 
    do={ 
/interface disable $PPPInter;
:delay 5s;
/interface enable $PPPInter
}
:delay 30s

:while ( $count < 3 )  do={ 
   /interface ppp-client monitor $PPPInter once do={:if ($status != "connected") do= {:set count ($count+1); :log warning  "PPP $PPPInter Link Down (#$count)"; :delay 10; } else={ :set count 4; } };
}
:if ( $count > 0 && $count <4 ) do={ 
   :log warning "PPP Link Down, Resetting USB Port"; 
   /system routerboard usb power-reset duration=10;
}
:delay 120s