The GE link bulbs are ZHA profile bulbs. You should be able to reset any individual bulb using the blink method where you flip it on then off then on than off. I don’t remember the exact pattern for GE links but you can look it up. What’s the bulb is reset it will flash two or three times quickly to let you know that it’s ready to find a new network.
STEP ONE: UNPLUG THE HUB FOR 15 MINUTES
Before you start doing that, though, the first thing to try is just unplug the smartthings hub for 15 minutes. This will be long enough that all the bulbs will panic and decide they need to find the hub. Well, technically the network but same idea. Then just plug the hub back in. This should pick up a bunch of the missing bulbs.
STEP TWO: IF ANY INDIVIDUAL BULBS ARE STILL LOST, POWER THEM OFF THEN ON JUST ONCE.
At that point the hub is online and it knows where most of the bulbs are, but there may still be some that don’t have a good connection. So the second thing to try is just to turn off the power to any lost bulb and turn it back on again. The bulb won’t flash in a pattern, you won’t see anything fancy, it will just try to reestablish the connection that it had before. This is often all you have to do to fix things.
STEP THREE: FOR THE LAST FEW ORPHANS, RESET THE BULB INDIVIDUALLY WITH THE BLINK METHOD, THEN TRY “ADD A NEW DEVICE” IN THE MOBILE APP
So that was stage two. Now the hub should be talking to almost all the links. If there are still one or two orphans, you need to try the blink method to individually reset those lights and then go through the pairing process again with the Hub, but save that for phase 3 because it’s the most work and it’s quite likely that phase 1 (powering off the hub for 15 minutes and restarting it) or phase 2 (powering off an individual bulbs and just turn it right back on) will solve the problem for many of the bulbs.
Note that you do not need to delete the orphan bulb from the smartthings network, or remove it from any smart apps, or rename it, or anything like that. All you’re going to do is physically reset the bulb with the blink protocol and then hit the + in the mobile app to add a new device.
STEP FOUR: if the bulbs continue to drop off over the next couple of weeks, you probably have to try looking for interference or adding repeaters
If after a week or two you continue to have some bulbs drop off after you’ve gotten them all online again to the hub, then you may have to start looking at Range or repeater issues.
Sometimes a remodel introduces new physical barriers in the home, whether it’s new water pipes, a new refrigerator, tinted glass–there are a lot of things that can reduce signal strength that aren’t obvious. Even some kinds of in wall insulation and some kind of wallpaper.
But save all of that until you’ve tried the first three steps above in case the problem is just a damaged network, rather then a range issue.