Android Lollipop wifi connection says "Authentication Error" for only some wifi's

[AC Question]

My phone does not connect to my office wifi from last 2 months but my laptop still does connect.
My phone says "Authentication error" for office wifi but works well with home and other wifi.
However my friend can connect to same office wifi from his phone so i think its not wifi issue

 

[bafuncio]

Some sites recommend to restart the router device, and sometime it works.
Instead of every time restart the router to solve this Android 5.1 Wi-Fi problem, it worked for me:

Inside the router configuration (e.g., accessing the IP 192.168.0.1), change the "Group key update" value from 0 to 30 seconds, under the "Wireless > Security" configuration, right below the WPA-PSK/WPA2-PSK item.

My router model is: TP-LINK TL-WR740N / TL-WR740ND.