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So I previously had a really long cat 5e ethernet cable from the router in the living room, all the way upstairs to my bedroom.

I like gaming, and obviously wireless isnt stable enough for that, too much interference which can cuase disconnections.

Problem I had was I never got a gigabit connection cos I guess my ethernet cable is too long.
Bought a new adaptor for my PC, and still didnt get a gigabit connection.

Bought a TP-PA8030P Kit and it now states I do have a gigabit connection.

Problem is testing transfers I dont get the full gigabit transfer, only get a quarter to a third of that.
Still faster than my previous connection speed.

But now I get random disconnects, and they've been getting more frequent over the last couple of months.

ISP says there'd nothing wrong.
Also when my PC disconnects, I can connect to the net via my phone and the family PC is still connected.
So it's only my PC which is connected via this powerline which disconnects.

I have updated the firmware on the plugs using TP Link's utility. But still getting disconnects.

So anyone know how to check and fix this?
Also why I dont get my full gigabit connection? Could it be the 3 port plug supports 1Gb in total, so 3 ports mean each port gets a third of a Gb?

Could my plugs be faulty?

Any help appreciated.