Unstable power supply during servo movement

[uniederer]

Observation
Using AZ-Deliveriy's Amica module to power the whole appliance, causes the display to flicker heavily whenever one of the motors, especially the servo for the flower head is moved. At times the servo doesn't move at all.

Looking at the supply voltage for the servo, it is observable, that the voltage drops to very low levels, presumably resetting the servo's controller.

Expected behavior
The motors shall not influence the rest of the circuits.

Workaround
Apparently powering the motors from a separate power supply (other USB-Port) reduces the issue (display still flickers but motors do also run properly) but doesn't fully solve it. It should be considered to implement a buffer (capacitor) for the motor supplies to bridge startup currents.