Most likely down to your provider...I use stb emu and before Xtream got took down channel changing was almost instant, now with the same provider it could be a second or two before some of the channels play
I have similar problem on 2 boxes. both are on version 2.20.09r2-pub-324. Is there another version after this? another mag 322 i have is a year older and have no problems. All are receiving from the same provider.