UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10032.86.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.140 Safari/537.36
Platform: 10032.86.0 (Official Build) stable-channel cyan

Steps to reproduce the problem:
when via shell prompt (ctrl + t) wifi_power_safe status, the result is: no wifi device available...
This problem occurs with different networks. At school, at home and at work.

What is the expected behavior?

What went wrong?
Since 2 months we have wifi problems with 80 chromebooks C738T, Chromebooks spontaneously lose WiFi connection. Wifi is no longer available
when via shell prompt (ctrl + t) wifi_power_safe status, the result is: no wifi device available...
This problem occurs with different networks. At school, at home and at work.

The number of chaperebooks with these problems is increasing.

a way to temporarily fix the problem is to reset the Chromebook or to shut down for a long time. It solves the problem for 1 - 3 days.

Disconnecting the battery also sometimes helps.

Replacing the internal wifi card for a new one does not solve the problem.
It is an Intel wifi card.

We are a school with 4200 chromebooks (acer) all included in Google G-Suite administration tool.
Google Chorme OS 63.0.3239.140

Is this a known problem?

Did this work before? Yes 63.0.3239.140 (Officiële build) (64-bits)

Chrome version: 63.0.3239.140  Channel: stable
OS Version: 10032.86.0
Flash Version: 28.0.0.137