I purchased the Deco X20 a few months ago. I have been plagued by constant outages and disconnects since the time of original purchase. The outages invariably follow "Database Security Updates".    

I have the latest Firmware Version. I have reset the Deco X20 multiple times. I have re-configured a different Deco X20 unit as the Main. I have disabled the Anti-Virus protection.  All to no avail.  The Deco X20 is highly unstable and has become unusable.  

I have seen that other users have been having similar issues with the Deco X60.   

TP-Link, this is completely unacceptable. I will be looking to return this defective product absent a permanent fix to this problem.