When you find offline next time, could you check your router and confirm device’s local connection is good?
Ok it just went offline.
I just check on my router, both strips are connected under online device (with DHCP)
Any update?
Do you have “Mihome” app? could you confirm if the device is offline too when it shows offline in Yeelight?
Ok the strips just went offline,
Both strips now offline on Yeelight app, and Mihome app. (both show offline )
Also turn on all and turn off all doesnt work.
But appear connected on router under online device.
I am still have this problem. See my previous reply. I have been trying to get help for a week now.
My new bulb also disconnects from wifi after maybe 15 minutes of use. After that I have to unplug it from power source and wait for about 30 minutes than to reset it and connect again. But 15 minutes later it stops to work again.
I am on the US server, most up to date app and firmware. Also my router is less than 2 meters from the bulb.
I don’t know if it is defective or it can be fixed with future updates.
Hello, I have the same problem here. Just got my Yeelight Mijia Desk Lamp. It goes “offline” after a time 2-30 minutes. I can still switch it on and off(all on all off), but nothing else. Mi Home App also tells me Miija Desk Lamp is offline.
Wifi is close and stable. Tried Singapore and US server.
After resetting and reconnecting it works for another 5 minutes… 
What can I do? At the moment it pretty much useless…
When it goes offline next time, please check your router and find the IP of the lamp if it’s still there. Ping it and let us know the result.
When my bulb goes off line it is not visible by the router. I have to disconnect it from power source for 30 minutes, then reset it to be able to connect to it again.
what’s the model of your router?
http://prntscr.com/hig89k it is still there… I got a “Telekom Speedport Smart”
Ping Test: http://prntscr.com/hig940 not able to ping it…
It is a Xiaomi router mini. Please see the photo. 
Here is the ping result for one of my Yeelight Strip (offline in yeelight & Mihome app, but online in router)
I am on US Server
Ping has started…
PING 192.168.0.21 (192.168.0.21): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
ping: sendto: No route to host
Request timeout for icmp_seq 4
ping: sendto: Host is down
Request timeout for icmp_seq 5
ping: sendto: Host is down
Request timeout for icmp_seq 6
ping: sendto: Host is down
Request timeout for icmp_seq 7
ping: sendto: Host is down
Request timeout for icmp_seq 8
— 192.168.0.21 ping statistics —
10 packets transmitted, 0 packets received, 100.0% packet loss
Its connecting and disconnecting randomly… I just found it offline again - this time it is not visible on the router config page.
Hello Staff? Are you working on a solution?
I actually give up on this. It is also too late to return to Amazon. I will just stick with hue strip next time (when it goes to sale, I can get it at $50) It just not worth the headache trying to reseting this after few hours or every couple of days.
These 2 strips will be my first and last purchase for now until they actually come with a solution.
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Hello Staff,
My Yeelight Mijia new bedside lamp bought on 2018/04/15 the latest firmware and offline at random time (~ one day), offline on Yeelight app and Mihome app, unless I reset power, it and connect again.
When offline It is not visible in the router,
The “Turn All On” and "Turn All Off, It does’nt work when it goes offline.
My Sever China, new
I see many people in similar cases Yeelight Strip keep losing connection
I think, it means there’s something wrong with the wifi module of your lamp or your firmware.
What is the current solution? Or I bring equipment out to the store to change ?
What’s the wifi signal of your lamp?
i don’t see the wifi signal of my Yeelight Bedside Lamp. Can you show me? thank you.