@Georgea8 SAME SAME...  i am connecting to tplink router and then connect my mesh to router. so the speed is not as satisfy as it suppose to be. when i connect y mesh directly to gateway. it is red light... 

@Mynameisclark 

Bought my M9+ 3 pack at Costco based upon great experience with M5 for my parents.

Random disconnects, update the firmware, no change. Tried downgrading, that did nothing either.

Disappointed, obviously no testing was done prior to shipping. I've read numerous posts on the community regarding V1 & V2 having the same problems. I'm returning to Costco tomorrow for something else.

Can't believe my FIOS WiFi is better than this product.

@Tim_714 

I spent 2 hours with Unfi (ISP provider) to solve the issue.
 

They ended up going via VLAN settings and then picking the correct country and provider. So for Unifi, it's Malaysia-Unifi. There were lots of other options, like Australia etc. 

Whereas I was trying PPPoE and Dynamic IP prior. On the Deco App you can select the VLAN option during the set up of the router. 
 

Hope this helps someone and saves them the hassle. 

@sofasonics I was able to fix the exact same issue with my Deco M5 by perfoerming a MAC Address Cloning. It seems the Decos have a hard time re-connecting to the Xfinity/Comcast modem after an inernet service interruption or when the modem is restarted. MAC cloining fixed the issue. By the way, tp-link support DIDN'T suggest this option, they just wasted 2 hours of my time making me power cycle the modem and the device.

I have also just fixed this no internet connection issue for my TP-Link Deco X60 Wi-Fi 6 AX3000 Whole-Home Mesh Wi-Fi System by rebooting ONLY the modem and waiting 5 minutes before turning it back on. Thank you very much for the tip!!!