Maybe because they want to make more money by getting more customers.
Networks always assign more bandwith than what they actually have. Maybe they increased it to a point what they assign they actually have and more.
Sounds like the powersupplies of the monitors is damaged. I will have a look at your power output as there might be something wrong. Have you send one of the screens back to the manufacturer and hear what they have to say what's wrong with the screen?
Just enter the wrong password 10 times and it will reset. That's if you forgot the password. If you want to flash or unlock it and its password protected then there's a file called virus.bin that you can use with mfi loader
In the end its still mobile broadband. Fake internet with data almost twice as much data usage due to sending out more roundtrips and there's no privacy on it. Then mobile providers signal ack even before the connection is fully established. The device can be how fast your still limited by your...