Wlan suddenly turned off?

We have Android boxes in use in our store for content (advertising, menus, films, etc.), in this case Minix boxes.

But after a while, when the devices are running, is in the settings that the wireless is disabled and then it does not work.

Strangely, I can easily connect to my phone or laptop and also suck data. Does such a 'device' have any capacity or limit that it can't suck data indefinitely?

Does anyone have an idea or a clue?

I would like to contact asn forum, if it is not because of a messed up config.
https://theminixforum.com/index.php