All the newer speed grades 500, 600, 1000, 1200, 2000 are backward compatible with the 200 Mbit series. My personal recommendation is to go with AV1200, for TP-Link that's the 8000 series.

If you have disconnection issues, the FIRST thing to do is NOT use the default password. If any nearby neighbor does the same thing, you'll be getting random conflicts.

That sounds like something you would address TP-Link Support for. User forum can hardly solve that.

That is not an uncommon problem. DSL and powerline use pretty much the same frequency spectrum, and if not taken care of, will crosstalk and disturb each other. Most probably, your house wiring has...

Try disabling "Wake on LAN" in the PC's ethernet device properties in Device Manager (if it's a Windows PC). You may have to dig around the "Advanced" tab to find it. I'm having similar symptoms here...

For the WLAN solutions it's really best to have all of them from the same vendor. Pure powerline adapters you can mix and match as you please ... however, a twin set of TP-Link 8010P is barely more...