Samsung smart TV using Smart IPTV app.

No sound on a lot of channels. Multiple providers have had this happen. Vader worked but it was the cost that made provider change this time.

The same provider log in info works perfectly on a LG smart TV using the Smart IPTV app. And on Perfect Player for Android.

Any ideas on what will cause this? Is there some kind of cachet that I should clear on a Samsung Smart TV? It's about the only thing I can think of. Thanks in advance