Hallo…
I’ve got a strange problem with my 2018 Kia Niro HEV. Three out of the four door actuators went out at the same time, and the only ones still working are the driver’s door and the boot. 
Anyone know what could cause this to happen all at once? It turned into a really expensive fix, and I’m worried they might not have actually solved the root issue.
Just so you know, I posted this in another group too, so sorry if you’re seeing it twice!
Best wishes…
Intermittent or insufficient power could be caused by a loose or corroded connection in the power supply line. 
Multiple failures could result from a defective power distribution module, which is in charge of supplying power to the actuators.
The actuators may 
not operate properly due to a bad ground connection.
Several malfunctions could 
result from a broken control module that regulates the door actuators.
Actuators and their wiring are susceptible to damage from dampness and corrosive substances. 
Components may fail before their time due to extreme heat or cold.
Occasionally, a manufacturing flaw in a batch of actuators could lead to their simultaneous failure.