HomeKit is a work in progress and I agree these technologies are new and I have everything Apple eco system and I do not currently own 3rd generation but I do have several other home devices and it is common when APPLE’S update software unfortunately changes sometime occur and it takes awhile for kinks to work themselves out. Further releases of apple’s software will fix disconnect issues just have to be patient. I also found hardwiring larger desktop computers using Ethernet will help with connection issues to HomeKit.
