Hi new to all this but here goes. Hi I bought an open box v8s to go with my open box f5 & im having problems. I’ve have got one in my living room & one in my dining room which both work great on their own. But when I put them both on to a scrambled channel that’s when things go wrong. 1 box will work ok for 15 seconds & the other just freezes for that 15 seconds then they swop over for 15 seconds & it just keeps doing that all the time. Can you help give me some idea what could be wrong please? My setup is 1 open box v8s , 1 open box f5 with a quad sky lnb