@Marathon2422
I already read from a lot of people, that they having the same problem.
I also tried to contact BQ and they answer me:
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try this one:
https://devices.ubports.com/#/frieza
With your WiFi, erase the search and turn of your router. Afterwards search again. Change the channels and WPS.
Try to reset the tablet, that will help most of the time.
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I wrote back, that this is not the problem, but no response anymore.