I have had this happen to me as well. I had LG TVs before but wanted to get AT&T TV so I switched them out to Samsung and have had all kinds of issues with sound on these TVs. When I get no sound on Pandora, I will open up another app like YouTube or Netflix and play something. If audio is working which it typically does then I go back and try Pandora. Sometimes that resolves it. Today it did or so I launched support from settings and went to Device Care, Self Diagnosis and did a sound test. After that started hearing sound in Pandora app on Samsung TV. It definitely is not the Pandora app, it is Samsung TV.  ... View more