Very low signal from hotbird,why

I have a question,i have a very low signal on hotbird, about 52%. The problem is that i had a cable guy turned the satelite to position it to hotbird checked for signal in his tester then plugged it it,i checked on my reciever and hotbird was locked so i said everything was ok so i paid him and he went on his way. A month later i tried to check the satelite but the signal is at 52%,i checked the satelite and it is tightly screwd so i am sure it didn't move,so i am guessing its the way the cable is connected to my reciever,so i am asking what is the proper way,is the metal strings from the wire affect the pemorfance???And if yes should it be cut or existed