Tenda router repair and solve auto reboot problem

This is my Tenda router. How this router restarts automatically after 10 to 15 minutes of running properly. I checked everything on the router, the router is OK.
I checked the voltage of the adapter. The adapter Voltage only shows 4.2 volt

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[MVVEdit]

thank you man your video helped me a lot my sincere regards to you 🌹🌹🌹

[Chunmun]

Thank you, this video helped me glad I didn't buy new one🙌❤

[yosyang]

Thank you. This bastard router brand come with fail adaptor.

I changed my adaptor and it works as it should.

[FahimRaiyan]

Thanks mate you're amazing.. you helped me ❤️❤️❤️

[shohanahmed]

The outpit voltage needs to be fixed? Cos I checked my adapter and the output voltage is approximately 8.30V. My Tenda F9 Router is auto resetting frequently! What would be the problem?

[jennyyanez]

Hola muy interesante su video...a mi router le sucede lo mismo pero el tecnico me dijo que era una pastilla, voy a probar con otro cargador pero no tengo de ese voltaje😔

[yosyang]

Mine usually reboot under heavy download or while video streaming with android.

But router more stable with computer. I replace the adaptor, and tried 3-4 times heavy download, then it works normal.

[brandonk]

Throw that POS router away and get a real router.