Whenever the A/C is on, the speakers will pop every 3-5 minutes. This happens independent of stereo operation. Research on the topic shows this is an old problem from the prior generation Pilot, and also exists on Acura TLX. Based on solutions found by forum members, the root cause is an under-engineered circuit for the A/C compressor clutch solenoid. Whenever the solenoid (de)activates the A/C compressor, a spike is emitted through the electrical system. When the vehicle is new, the clutch relays absorb the shock. As the relays wear, they can no longer absorb the electrical shock so the interference is heard through the stereo. Simply replacing relays is a stop-gap measure. The relays will continue to see the spikes and eventually they are ineffective from filtering the spikes. In my video below, the vehicle is only seven months old.