Ok, so I just put in LED bulbs in my reverse lights and the license plate lights. It looks good, nice and bright, but one strange thing. After they're on and I turn them off, they'll blink or flash every couple of seconds. This eventually stops after like an hour or so. I dont think there's a current running through them because the car's off and there's no key in the ignition. Could I be wrong? Or is this just residual current from when they were on?