I have exactly this issue. I have had a deco repeatedly start flashing red and dropping connections. I have tried rebooting, resetting all decos, switching the decos anround and have even put in an Ethernet backhaul cable so there is no reliance on wireless or Powerline… and still the same problem. I had a similar problem with v1 deco p9’s, and so I bought some v2s. The issue is the same and suggests that, like so many others reporting this issue, this is a firmware bug that needs addressing, Can anyone help, or are the P9’s now destined for the big e-waste pile?