Its its just a plug and play setup with no harness, there will be no separate grounds, thus probably not likely the grounds are loose.

Sounds like those error cancellation (usually capacitor) isnt working properly.

If you run a relayed wiring harness off the battery that should do the trick, however you could try a different set of capacitors first.

I had the same issue with my HID fogs, decided to run a custom harness and no more issues for me.