[Sephiroth]

There are two things wrong in order of priority:

1/
Your upstream is flapping (that means dropping and coming back). The evidence is the 57 dBmv power level, which is the point at which the circuit resets. That is the cause of loss of service. Furthermore, you are only provisioned with 1 upstream when there should be 2 or more. It is impossible for your circuit to hold up.

2/
Less important but nevertheless noteworthy - your downstream frequencies are incorrectly sloped. This won't mean anything to you, but the power levels at the lower frequencies should be higher than the power levels at the higher frequencies. It prolly isn't harmful given your upstream problem, but it is not how VM intend the downstream amplifier settings in the street cabinet to be.

The technician should have checked that all out. Is there an attenuator attached to the rear of your hub? If so what is the value in dB stamped on it?

Do any of your neighbours have this problem? I would expect so.