I have recently gotten my hands on several Martin MAC2000 Performance fixtures that have been heavily used but still seemed to be working fine. I did a very quick test of all the functions with them sitting on my stage and everything looked fine. I have now hung them (so they are upside down from before...which may not be relevant info). Each is plugged into a dedicated 20A 120V circuit from my Unison rack (using the CC20 module for constant non-dim power). As far as I can tell my power is stable. Shortly after striking the lamp on two of the units they start flickering (but a slow flicker, more like a "mode change"). I have everything open (no color, shutters, iris, etc) and just point them at a wall for initial tests and they flicker. They do not flicker at the same moments as each other and the flickering pattern appears to be random. They seem almost to be jumping to a 80% mode and then jumping back up to 100%...almost as if there is some sort of "power saving" mode that it is jumping back and forth between. Does anyone know what might be going on? Thanks!