Not all wireless devices are equal and wireless signals aren't very predictable.
I suggest you suspect wireless interference as a possible cause - from a neighbour or from one of your own devices.
I suggest you download an app that checks wireless network quality and signal strength.
My own wireless network is highly variable in it's performance and so I used an app to check this. I found when seated only a few feet from my own router a signal on the same channel from a neighbour was much more powerful. Sometimes I would get good performance two floors up but often nothing at all in spite of the system claiming to be connected and communicating at a good speed.
OK, this is a common issue with Android, even with the Nexus line.
Try to connect again, if it does, check for how long it holds. Usually you can see if it drops by just rolling down from the top.
If there is still issues with it, tap the Airplane mode and leave it on for some 10 seconds, tap it again to turn it off, test the wifi connection again.
Also, you can forget the network, reboot the device and search for wifi. (This means that you have to type the network's password again, as if it was for the first time).
If nothing works, then you will have to factory reset your device. But unfortunately this is a common issue in Android.
Please check everything in the "charger chain"
The charger, the cable and all connectors. All connectors should be clean and shiny. When you think there could be some dust in one of the connectors, try to blow it out with a bellow photographers use. Don't try to remove anything with sharp or pointing things, You could break a contact or damage the connector. Check the charger, if it still is working (giving enough power) and check if there is not a weak place in the cable. Don't forget the connector in the tablet.
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