I have 3 S4's and 1 M4R. I have 1 S4 cat5e wired to my vodafone router and then 1 cat5e cable to an outside bar wired from the S4, the other 2 units are connected via mesh/wireless. They used to all work ok but now the download speed when on our iPhones is terrible, streaming seems to be ok though. I've done all the normal, reboot, update etc. I've fixed my bandwidth to 2.4ghz from the router only as I have many devices that only connect to 2.4. Help please