I was on a road trip yesterday. I like to have Waze running so I don't run into any speed traps. But I noticed that despite being plugged in and charging (lightning sign was visible), the phone battery was still draining. Not as fast as it would without being plugged in, but still draining. I've never run into this issue before. Is the combination of bluetooth audio and Waze just too draining for the charger to keep up with?