Wake on lan

hi all, i have a samsung UE49NU7100
i try to turn it on using wake on lan,
about 1 in ±20 times im succesfull, the other times the tv doesnt respond,
is there some trick ? i tried different wake on lan apps and wireshark is showing the correct command, but my tv only reponds 1 in ±20 times, sometime 5 in a row its good, then suddenly stops working…