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That is a realtime network error.

1. Have you run a latency test on the PC?

2. What s PC hardware is being used?

3. Have you disabled all power management in the PC's BIOS?

4. What is the result of the command (typed in a terminal)

ip a

?


 

 

He cambiado U5 y U7 ahora me salta este error

There are (often) cases where negative sides of power supplies must be wired together, but usually not at the power supply, it is done on equipment from one part to another. This avoids loops and keeps stuff at the same potential.
There are cases where this is not allowed at all.
So the short answer is yes and no, you have to know what you are dealing with to know if this can be done or not, and is not something you can just read on the internet, it requires deeper knowledge of the subject.
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It is easier to answer if you give us exactly what you need to do.