When replacing / installing a VIM/BUC/LNB/RT, it is crucial to use the right torque when mounting the N/SMA connector. This is to avoid that the connector to brake loos from the PCB
Make sure that the connector is tighten to right torque, using a torque wrench.
SMA connector. VIM, Ku LNB. = 1NM
N-connector. BUC, Ka LNB, BCM. = 2.5NM