Patience ... this is not a manned helpdesk, it's a user forum.

Have a look at your physical connection rate - use the TP-Link Powerline Utility software. Then optimize how and where you plug the powerline adapters. Don't put them into power strips, put them straight onto the wall outlets. If you have PLC with passthrough sockets, plug your electronics (or the powerstrip running the electronics) into it, not into a nearby other socket. See whether your household has any other equipment that introduces electrical noise into the mains wiring. There are many possible sources, from large devices with motors (fridge, washing machine, freezer, dishwasher etc.) down to anything that has a voltage regulator inside - all the electronics, the wall warts, the phone chargers, and even CCFL and LED lights.