@ShujaK Is the Etisalat modem also a WiFi router? If so try putting it in bridge mode 1st they try to set up the deco

@Sledge73 Warranty policies typically vary by product line, region, and purchase location, so I'd recommend checking the warranty information on the official TP-Link website or the documentation that...

@Sledge73 it still might be under warranty do you know where you bought it and the date of purchase?

@28Oscar_30 You could try to reset one of the units that went offline by pressing the button on the bottom of the unit for 1 second and then seeing if you can add it back using the app. If it works...

@Zpmrk Sorry for the confusion i swore you were hooking up all your deco's via Ethernet backhaul @Adam-ITComms is correct about the WiFi speed

@Darshan_S See if the steps in this post helps https://community.tp-link.com/en/home/forum/topic/656154 If not please get back to us thanks.