I recently had Exede installed at my home. When tech left i had 11mbps on a speed test. Now I have less than 0.5mbps. He never tighten down the bolts on the dish. I redid it from the start. Got a good signal. RX Power 43.4, RXSnr 8.7, Cable Resistance 2ohm, Cable Attenuation6.6 dB. Any ideas?