@El_Ranchero Hi, I am still on 1.2.1, have not upgraded yet due to the reported issues. 

TP-Link really needs to improve and provide better support for their products.

@Vesper 

Found solution

After using all beta and released firmwares, disabling or enabling every option in setup, months of constant issues with tp link archer c6 v2

I found solution to make this router stable.

I bought a new router from other maker! and tplink lays stable in my trash bin. Do not even bothered to send this brick for warranty. Bye bye tplink. Never again in my life.

@oulymouly 

Don't be upset, maybe in a few years a stable firmware will come out. I am waiting a year for the possibility of turning off Onemesh in stable soft. On the other hand, I bought a Tenda AC8 to replace this one and quickly apologized to the C6, that $hit resets after a few days even with the overnight reset option. With him C6 is a miracle, but still waiting for the non-beta firmware, excluding onemesh. 
What did you buy?