I just bought a 40" Hisense Roku TV model 40H4030F for my bedroom. I keep the TV on to help get me to sleep, but turn the volume down to 1-2 bars before going to sleep. I've noticed what sounds like white noise that distorts low volume speech, so this morning I turned the volume to zero, walked up to the TV, and the speakers were obviously crackling and producing white noise. When I hit the mute button, the crackling disappeared and was quiet. Is the crackling/white noise normal for this TV with volume at zero, or a problem with the TV and needs to be returned for another one? I've attempted to contact Hisense, but the wait times are ridiculous.