How weak and pathetic is this dock? I only have an iPhone SE with the smallest battery in current smartphones, and it can't even hold a consistent charge. The phone is constantly going in and out of charge which triggers the Windows alert sound of a peripheral being connected/disconnected. There is nothing else plugged in to the Surface Book, and the only thing connected to the dock is the phone, yet it can't hold a charge. Is this a hardware/firmware issue or is the dock seriously that bad?