I purchased the DPA4017b set from B&H about 7 months ago. I love the mic but after 4-5 months I started having serious RFI problems with my TX742. (See Video) Does anyone know how to solve this? I've spoke to DPA and they say that I need to send in the preamp so they can evaluate it. I'm living in Mainland China so sending anything out of the country or receiving anything from out of the country is a problem. I previously used a RODE NTG3 for years without a problem. I really expected more from a mic that cost more than $2000!!!