Have had these Deco X60s for just over 2 years and recently my Alexa Echo Dot, iphone and MacBook Pro have been having issues where they cannot connect to the wi-fi network. On the iphone and MacBook it is saying wifi password is incorrect, even though the password hasn't changed in a long while and other devices are able to connect using the same password. When I reboot the main deco, it seems to correct the issue temporarily. The iphone and Macbook pro area able to connect, althooughh the Echo Dot still has issues. This doesn't last long though, as usually within 20 minutes to 2 hours, the Macbook Pro and iPhone lose the wifi connection and start getting the same password error when reconnecting. 

I hadn't added any new devices, changed passwords or made any changes to the network when this started happening. Just came out of the blue. 

Thanks for any advice anyone can provide as to how to solvle.