I own a Sennheiser 100 Series G2 wireless lavalier system. I get a buzzing sound on the transmitter, when I'm shooting indoors in tight quarters. The buzzing intensifies the closer the transmitter gets to a wall or electronic equipment (home televisions, stereos, etc.). I don't think that the microphone or transmitter pack is broken because the buzzing immediately goes away when I shoot outdoors. Does this phenomenon sound familiar to anyone? What can I do to protect my transmitter from buzzing indoors? Is there a way I can shield my mic/transmitter from this interference? Thanks.