Welcome to the community
I would just like a bit more information so if you could answer the following questions.
Looking forward to hearing from you.
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Thanks for getting back to me, so just to confirm, you're experiencing this issue intermittently? How long does the sound last?
Are you using any third party audio equipment like surround sound or sound bars? How have you got your set top box connected to the TV?
Sorry for all the questions, we want to get to the bottom of this ASAP.