TS112A - Sound cutting out intermittent

Hi, I have a TS112A and it has started to have problem where the sound cuts out and all I hear is small fizzy sound then normal sound comes back. The way I'm using it is simply my left mono out from Pod HD500x to the TS112a. Tried both inputs and lowered gain and same issue happens. If I go directly into my PA system, no issue therefore it is not my pedal or cables. Could it be the amplifier itself on the TS112a ? Thanks
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