Hi

Hope you can help.  Recently installed 2 Deco M4R, one as AP, one as satellite in my house.  AP connected to Virgin Hub 3.0 Router/modem by short ethernet cable.  

Fantastic WiFi signal coverage thoughut house and usually good down/up link speeds (>50Mbps).

However, frequently my two Android phones that only support 2.4GHz WiFi suffer severely slow connection. I mean 200kbps or less download, sometimes with upload OK >10Mbps, sometimes no upload such that OOkla speedtest won't even start.  

I've tried with/without Beamforming & fast roaming. No difference.

The only thing I notice is that when this occurs I am sort of equidistant from the 2 Deco's and WiFi analyser shows similar strong signal strength.  I'm wondering if the two Deco's are causing co-channel interference and destroying each other's signal. There are no other WiFI networks on closeby channels.

Can someoen advise if this is possible cause or what else it coudl be & what I can do.

Thanks