I dont think that this situation is caused by high SWR. I have chcecked it by Diamond swr-meter and it shown quite exactly 1.0. I guess that common mode current is a problem because when I move cable in station controler neighbourhood it hangs up at some cable posiotion. I am using pretty well manufactured H155 feeder with good and dense copper-wired schield. RF can't leak much from it, all the more i set only 2W transmitter output.
Mateusz Lubecki SP8EBC -- https://www.youtube.com/watch?v=HNZd2JIhYbE