ZenPad 8 Z380m. Android 7 problems

[Bernard2017]

I have just upgraded to Android 7 through normal system upgrade. The ZenPad 8 would not connect to my router after upgrade, it would connect to just about any other router but not the one it has always connected to (Tp-Link). The ZenPad 8 would connect get an IP then reboot over and over again until I turned the WiFi off. The only solution I could find was to set th WiFi connection to static IP, now it works all the time. Very strange this should happen after the upgrade.