I bought a 8' dish from sadoun and 13k lnbf cheapo from ebay and I have a pansat 2500 receiver when I set up the sistem i was geting all the chanels from satmex after 2 weeks the transponders started to get weaker and weaker to the point that some of the transponder I was geting 60% quality now i'm geting 30% and just can watch them I been trying to realing the antenna but that's the best I can get 30% could this be due to a faulty LNBF?