Hi  @Marcin1518,

The feedback for the post you mentioned has been around for a long time. I suggest you update the firmware from the global official website, which is also the EU version.

https://www.tp-link.com/en/support/download/tl-wpa8630-kit/#Firmware

Please refer to the FAQs to update firmware: 

How to update the firmware using the tpPLC Utility on Windows 

How to update the firmware of Powerline ac Extender via web-based management interface (new logo)

  @Joseph-TP 

I don't have access to web configuration. I can only connect using tpPLC app and in this app I can't use .bin firmware file. I need NVM and PIB files, but from the link you provided, I can only download a .bin file.

Hi@Marcin1518,

The latest version of the firmware for this product currently contains a bin file, which is mainly used to update the powerline extender TL-WPA8630. You still need to log in to the web interface through the utility to update.

For the firmware of the powerline adapter tl-pa8010p, there are the NVM and PIB files you mentioned, but the version is old after all.
https://www.tp-link.com/en/support/download/tl-pa8010p-kit/v2/#Firmware

I suggest you try to update the firmware of the powerline extender TL-WPA8630 and then compare whether the problem has been improved?

How to update the firmware of Powerline ac Extender via web-based management interface (new logo)