I had a similar problem with mine. The static/blurry sound in the left ear while streaming audio via the ICOM started in the evenings on day 2 after I got the aids and got progressively worse until it was present in all modes 2 days later. The RIC portion was replaced - too sensitive to moisture and/or a bad connection.
Now on manual zoom and sometimes on autozoom and manual I still get an occasional “crackling” or “snap” but it’s so intermittent I don’t worry much about it. Again, I think it’s a moisture/humidity problem caused by going in and out of heavily air conditioned buildings and hot, high humidity outside.