[A320neo v2 systems froze mid-flight]

But something that also happends to me is that all the systems will go fully dark, like if it was dark and cold magically without a reason and the APU starter won't work, so y have to CTRL+E to make everything start again

[A320neo v2 systems froze mid-flight]

It happens to me everytime I touch de TCAS, for example, in the middle of a takeoff or similar.

But yes, it happened something similar to what happended to you