So about a month ago, my setup slowly started to die, and has for a couple weeks not been recording positions at all. My setup is the FA Antenna->FA Filter->Inline amp->DTV Power Inserter->RPI. I did about the time I started having lower stats replace the SD card with a clean install of piaware. Today I finally decided to investigate some, and already swapped the USB dongle, DTV power inserter, and taken out the Filter(never noticed much improvement or change in stats).
I had a similar issue a couple of weeks ago - checked up everything and ended up replacing the inline amp. I few days ago I noticed that the stats started to degrade again and now I am wondering if it is the amp again. Both amps are PerfectVision amps.