Have your door actuators done this???

[Roadster]

I have notice that since owning the Z, the door actuators make all kinds of weird noises with the doors or door opened. They seem to buz and or try to move on their own. And sometimes they seem to get stuck in one position or in another. I would imagine that this is a common problem with C4's, although I don't remember my 35th Anniv having this problem way back then. Also I don't have the remote key FOB for the vehicle.....
1-So I would assume that the actuators need to be replaced???
2-On a side note, I have also noticed that the interior dash lights appear to flicker when first starting the engine, another C4 gremlin???

thanks for any info.........