@Jetdrive 

yes, I had exactly the same issue. Tried rebooting, unplugging,... eventually I went back to firmware 1.1.2 because that was the newest one I could find on the web page. 
 

I had 1.1.4 installed before 1.1.5. 

  @YBen 

I called in for support but they say they can't resolve the problem so are escalating it to the system engineers. They said there would be a lengthy delay before I heard anything back. 

I also downgraded my firmware to 1.1.2 because it's the latest I can find. 

  @Jetdrive

Thanks for the update, that is rather annoying ! 

  @Jetdrive or @YBen re either of you running wired backhaul for your nodes or wireless backhaul? Curious since I've had a terrible time with the last 2 firmware updates on these routers, and after this post I'm scared to do this one since my system is working fine right now.

  @JDub2899 i am running wireless backhaul and both satellite routers disconnecting after few hours like others said. Poor quality control. 

  @SoapOpera 

i am running one wireless and one wired. Both disconnected after a while. 

 For whatever reason, I can't even login to my router to downgrade. Multiple reboots, still not able login to tplinkdeco.net or the router ip. 

anyone?

  @YBen yeah, based on that I think I'm sitting this one out. I don't want to be 0-3 on firmware updates and have a house full of angry people that loose internet access. 
 

As an aside, the firmware upgrades in these really seem to be a debacle. Kind of scared to change anything moving forward. 

  @JDub2899 

I'm also running wireless backhaul.