I bought a 4 pack when they first came out. Activated 3 initially and kept the 4th as a spare.
The 3 that I recently re-paired to a new network, can’t be controlled any longer by the app. They show up - but do nothing. (Bricked as the v1 Sensors)
The 4th (un-activated one) works fine. It shows the current date of activation and is fully controllable. So the issue lies with the previous activation of the bulbs.
They should be able to fix a software glitch that they created.