I just received a replacement Note9 and having same issue ... audio keep dropping no matter what app I'm using including phone. Restarting phone and even factory reset do nothing. Very frustrated Even cleared systed cache. Very frustrated. Was told to visit a Samsung service center which I will do. Nit sure what they will do but unless they know what the root cause is I'm going to ask that I be let out of my contract, refunded and go back to Note8. The phone is worthless without sound.
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