I'm having LIFX issues as well. I've given them static IP addresses.
I have 2 of them. A while back, one lost its mind and I was unable to get it to add into the LIFX app even. No clue. Tried a new LIFX bulb, no luck and no idea why it suddenly refused to add into the app. I suspect there is a router issue with their app.
However, the other LIFX bulb was working fine both in the LIFX app on with the Hubitat.
Until recently. The last event for this up-until-now-working one was 6/16...and I no longer see it as being in the LIFX app (and a refresh does nothing). This one, however DOES work from the LIFX app itself (just not the Hubitat). It looks like I was on 2.3.2.127 when it last responded.
Odd. Frustrating. They have a useful shape for my purpose, which is why I got them--but they are very annoying in terms of working properly lately.
Just a couple ASUS wifi routers in an AiMesh. I don't have a fancy Data Center grade network yet (looking at what I could do with Google Fiber 2G...I keep pondering an upgrade ).
Not sure if this helps anybody or not but I was having similar issues to the LifX bulbs having communication issues not only when adding but also when trying to command through my Hubitat. After they were added, I disabled the ability for the LifX devices to "roam" on my mesh network. Once I disabled that option, I power cycled the bulbs all has been working great.