Yesterday i had some problems also with my SRC B1 in switch mode. I had some random drops and heavy RF noise even in interior. I had only my SRC (both frequencies where very separated), a G3 in range A and ifb lectrosonics on block 28. My scans wheren't so clear, but o found some clear frecuencies, some times it was ok, o suddenly some heavy intereferences happended. I had luck that when talent where speaking it didn't happened, i was no more than 3 meter from talents. I had tested my SRC on Ratio mode and haven't had any problems. I will continue to test them in switch mode to know if the problems persist or if it was only Rf vudu. Im located in barcelona, spain, as Diego. Haven't contact my dealer yet but if the problem persist, will contact them.