Good night, I will tell you a little about the panorama to see if you can guide me to the solution I am making a VPN site to site type sstp between two routers, one the RB2011 server and another the RB912R-2nD client of the LTE type, I use the remote router As a modem through the 232 serial port, the problem is that the lte link down / LTE link up occurs repeatedly and the VPN lifts, the cpu goes to 100%, which I solve by deactivating and re-activating remote access to serial 232 , in normal condition the CPU does not exceed 100%, the issue I do not know how to solve the issue, if possible any idea … I would appreciate it