At my High School, we are running 21 body mics currently: 6 Audio Techncia 3100, 8 AT 310, All in the "D" Band; 4 more AT's in the 500's, and 3 old Sennheisers. The issue is this: Mon, Tues, and Wed. dress rehearsals all worked perfectly, then Thurs, Opening Night, Half way through the show, 3/4 of the AT's Audio cut out; every connection, wire, RF, antenna, and battery was still at full. We (Theatre Director/Me) called a professional from the county, who is very good, and he said that everything I did was all he could do. We then called a professional dealer/company in the area, and they came out. With them, we re-addressed all of the mics, and again checked every connection. only issue was a slightly faulty antenna splitter. they replaced it, and gave the system a clean bill of health, and left. Last night, by the start of the show, only 13 mics were working. They now had half RF and no audio. I have no idea of what to do next, as there is a final show tonight, and although we were able to run with 13 mics, it is much more difficult with quick changes, and fast re-taping. Any Ideas?