@Maltawifi 

Hi, please describe your problem in details, then we can try to figure it out.

If the internet connection on the A6 is not stable, please verify what kind of connection type you are choosing on the A6, whether you have a stable connection if you connect the ISP modem to the computer directly, etc.

May I know who is your ISP? If the modem connection is confirmed to be stable in this way, then check and ensure the cable between the modem and router is good, try to plug it firmly on both sides, or change with a new cat 5e/6 cable.

Please also confirm how often does this Internet disconnect issue happen? If you haven't tried to reset the router to factory defaults, give it a go first, then set up the internet from scratch to confirm if the internet connection is stable.

You can also install the beta firmware we provided here on your Archer A6, then disable Onemesh on it, monitor the 2.4G connectivity again:
https://community.tp-link.com/en/home/forum/topic/207232