@Gabe_S 

I got one AX3000  yesterday (or AX50, who knows what is what) and have the same problem. I went straight to TP-LINK to upgrade my router but I installed, worked fine for a few minutes then started lost connection, internet off line, very very week signal, then comes back. My Kase  light bulbs, plugs and switches does not recognize it.

I'm just returning, I'm not waisting my time with this one. Re-installed my old one and everything is fine.

My great disapoint is that it also does work with AC1200 Mesh extender, ridiculous. Sure returning and reconsidering if I really need a new one.

@ADRStudio same story.  TP-Link got tired of trying to resolve the issue and is sending a new one (after I pay to ship this one back).  I put the old router back and everything works fine.  Now I'm regretting trying to upgrade in the first place.  I'll probably return the defective product and just get my money back.

@Gabe_S  I just drop back mine, returned.

I tried again yesterday and the same think. Not sure if I will try another one, or another brand.

When I put back my old one and everything came back, I think I gonna keep this way, make the upgrade later, 4th ot July discounts or something.

The AX3000 does not work with mesh although it say on the AX3000 website page that is does, when you click on more more details for Mesh you can reach a page that does not show AX3000 as compatible. I think TP-LINK people are a little confused or are desperate to sell.

Another thing, I tried to chat with support yesterday early afternoon and no answer at all.