Mi Bedside

I have just bought a mi bedside today. I connect my device to my wi-fi and bluetooth and tried to use but I could only see it online for a couple of seconds and then it went offline. I have reset the device many times but I can’t see my device online more than a couple of seconds on my application

Please have a check if the lamp in your router’s DHCP list when it is offline.

No it’s not on the list