We have a number of WPA4220 Kits (with AV-600) around the house, and whilst they do work, they are constantly having to be turned off and back on again to re-establish the connection to the internet. We also have a couple that don't work anywhere near as well as they should speedwise presumably because they are on a different electrical circuit to the master plug that directly connects to our broadband modem/router. So, we are thinking that maybe adding a few Deco X55s might improve the situation, but can these two TP-Link products work together, or would we need to completely replace our AV-600 and WPA4220 kits with X55s?