I have a Deco AX1800 DX20 mesh system with 3 Modules in a single family home.  My neighbor has a Deco M5.  I constantly get Wi Fi disconnected and find that his signal IN MY HOUSE is stronger than my signal.  I called TP Link Support who informed me that I CANNOT MANUALLY change my Channel which is ALWAYS in a high traffic number.  My Channel is 3(5) and my neighbor with the M5 is 4(6). My 3(5) is always a high traffic channel while my neighbor is always a low traffic.  My Wi Fi analyzer always shows that a couple of my neighbors have stronger signals than me..In doing a Deco analyzation.   I receive the following message:  WiFi Interference: HIGH.  CO-Channel Interference: 5;  Adjacent Channel interference: 2  Current WiFi Band: 50 Best channel: 48.  I asked if I could return my DX20 with TP Link and they said no.  I am also beyond my Amazon free 30 day return because TP Link support told me that they are working on getting manual channel change. However the latest support person HONESTLY told me that is not going to happen.    Now I am out $200.  My Netgear N 300 with a Netgear extender allowed me to change channels but I had one dead spot and my BLINK exterior cameras needed stronger WiFi signal and I thought this mesh system would solve the problems..  No such luck!  Any suggestions or resolutions would be appreciated.  Thank You. Martyparty.