Spotlight turrets keep going dark?

To bolster my settlement defense, I recently added some spotlight turrets in Sanctuary to sit alongside the machine gun turrets. I connected them to power and watched as they came to life, rotating and shining bright.

After fast travelling out and doing some exploring, I returned to Sanctuary to find the turrets unlit. They are still connected to power, everything looks wired properly, but they are simply off. By going into Workshop mode, picking up, and placing the spotlight back in the same exact spot, it turns back on. This happens every time I leave and return to the settlement.

Power is also not the issue... I have more than enough power to light these. Everything else is properly lit upon returning to the settlement besides these turrets. I actually built a separate Medium Generator (generating 5 power), connected it solely to 2 spotlight turrets (requires 4 power), and after initially working, were off when I returned to the settlement.

Is there any reason these spotlight turrets keep turning off?

Edit: Taking a closer look at these malfunctioning turrets, I realized they are actually rotating back and forth, so that portion of their functionality is working, and makes me further believe this isn't any issue with power. They are just rotating with the light off.