@MjkCT Hi, welcome to the community.

Do you mean the Decos randomly restart themselves after updating to 1.2.7, or the internet connection is unstable on Deco so that you have to frequently restart the Deco to  restore the connection?

If it is the first one, have you noticed any LED status change on the Deco, like from solid green->yellow->red->green again?

It would be highly appreciated if you could share a video clip with us.

By the way, you could downgrade back to 1.2.2 directly via web UI by uploading the 1.2.2 bin file.

https://www.tp-link.com/us/support/faq/1599/

Thank you very much and wait for your reply.