If signal is good, there's three things it could be
Damaged cable or connectors - visually check every inch if the cable and disconnect all connectors and make sure no damage.
Electrical issues - usually caused by bad house wiring involving the ground, can be checked be temporarily using a three prong to two prong plug adapter that will disconnect the ground.
Bad receiver - if it's not either of the above issues then most likely need a new receiver.
Can also press home three times (I'm assuming it's a hopper), then go to history on the left side. What we are looking at are the numbers next signal and then also next to internal resets. If the number next to resets is more than like 10% higher than number of internal resets than you have signal issues, refer back to first two options. It is still possible to be bad lnb or hub as well but not very likely if signal is showing good.