Day-time running light

Hello, I have the daytime running light of daylightrunning / papenburg where the remote light is reduced to 25 %. now I noticed that this daytime running light runs out, for example, if the engine runs only in the stand gas at a traffic light. as soon as the speed rises again, the light aiuch goes on again. knows if this is normal and I noticed it only now, after a few months, or is it a defect that actually occurred only now.