I have four TL-PA4010Pkit_AV500 powerline adapters in one network: one is connected to the Archer C7 router and to electricity network, three others are in same electricity network, connecting 3 computers to the router this way. Thing usually go well, seeing tpPLC from a computer shows like this:

Then, in a non-regular (non-periodic) way, suddenly the image shows this (all 4 adapters):

and at this moment, the internet connection is lost in my computer (interestingly enough, the other two seems to work properly). It is not connectable to pause in internet usage. Anyway, power saving mode is OFF in all devices, as well as in the Ethernet chipset in the computer.

Any idea, how to secure the 'upper image' situation above?

Thank you!