I have similar issues as yours but only with Z-strips. I opened a ticket a few minutes ago to see what I can do.
Here are some of my technical details I sent to the support team as well.
Router: Linksys WRT3200ACM
Channel used: 7
Channel width: 20 Mhz
Network mode: 802.11n Only
DHCP Least time: 1440 mins
Firmware: 1.22 on both of them
I have for 4 more bulbs which work without a hint.
Problems I’m seeing with the Z-strips is that i have lots of packets drops as I’m pinging all 6 device and while the 4 bulbs are working well, the 2 strips have issues.
I connected on the strips using my wife iPhone and saw one strip has 3/4 signal and the other 2/4 - 3/4 signal. Normally you shouldn’t have issues with a device that is connected and has only half signal coverage.
While reading through this post I am starting having second thoughts on why I haven’t went with Philips Hue as they had those remote wall light switches so I could’ve replaced the “normal” lights around the house as well.