External hard drive defective? (Always logs in and out)?

My external hard drive "logs in" again and again - if you can understand what I mean by this: There's always this tone that it is connected, then a second later that it is not connected to me. What can I do? It is not the cable, I have already tried two different cables. The hard drive is a Lacie 2TB, my laptop is the Dell XPS 13 9380 - if that helps.

Maybe only the controller of the HDD case is defective.

Exam…

Take the HDD out of the case and install it in the PC, then test it.

I would spontaneously tap the first thing that the USB port does not provide enough power

Listen, if the hard drive's motor also turns on and off

The hard drive (the motor?) Keeps running all the time. Only it is recognized by the PC almost briefly and then not again. Everything worked wonderfully until yesterday. I've already tried the other connections.

It is good that you replaced the cables first. That would also have been my first test. So we can rule out.

Have you also tested different USB connections?

If it is not because of this, then it should be an internet hard drive defect.