I cannot change language channels smoothly

I am an interpreter. When I am assigned as an interpreter and try to switch between the two channels, the channel button runs away from me so that I cannot change channels right away. This is a serious problem for my occupation and I know another interpreter who also have this problem. This started to happen after the update to be able to move the channels. Today it took me about 5 seconds to change from one channel to another.... Please help.