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Intermittent signal is usually a case of a loose connection or a short.  I see that R5 is socketed.  If it works loose, that could cause an open circuit.  Check that.  Next, try re-soldering all joints. ( Remove power and the IC and transistor first.)  You may have a cold solder joint that is turning on and off.

If these fail, try using an audio probe to trace the signal path to find an open or short.