Losing Wifi to iphones and ipads

Recently I bought a switch to replace 2 smaller switches because I had some hard wired problems and the new switch has made a big difference and all is good on that side of things but on the wireless side, connection to the ipads and iphones and some other wireless devices are shoddy, going in and out.
I have the RT-AC87R which I love but don't know how or why going to a new and very reliable switch could cause this problem or even if it's related.
I'm running the latest stock firmware but...

Losing Wifi to iphones and ipads