Three devices defective in a row: Elgato NetstreamSat!

My first Netstream Sat has taken leave after about 6 weeks, initially sporadic jerking of picture and sound, then more and more often to the complete termination of the connection to the Mac. The replacement device then about 6 months persevered until the same slow death, the third replacement unit was already after 14 days there, same symptoms, only sporadic jerking, then no connection. I have now given up and will be ordering me not a new NetstreamSat more, even though the idea was really great (as long as it worked). Unfortunately unresponsive after a first friendly contact the Elgato Support, my question after a series problem in this series was probably too much ... The replacements on Amazon have as always works very reliably and quickly. Elgato EyeTV Netstream Sat Network Tuner for DVB-S2 silver