It will drop. The roaming between two APs is not seamless roaming.

TL-PA2010KIT means two TL-PA2010. So you can just use the firmware of TL-PA2010.

I will try to reproduce your problem to see if we can figure out what the problem is.

The network name of powerline adapters will not be changed unless you use the pair buttons or you change it yourself. When this problem happens, please try to reboot your powerline adapters to see if...

Your product is still within warranty. So please just contact the retailer from whom you bought this product to replace it with a new one.

Does this same problem exist when your macbook pro is connected to your WPA4220 with a cable? I will try to reproduce your problem in my lab to see if we can get anything.