Apple Car Play - ‘plop’ sound

[LeadFarmer]

When connecting my iPhone by cable to my car and open up Car Play I’m getting a constant ‘plop’ sound every 5 seconds which ruins my music listening. Like the sound of dripping water.

Any suggestions please?

[LeadFarmer]

Tried different cables but no success.

I can prevent the plop sound by turning my phone to silent, but I assign it's a connectivity issue, or a notification of some sort?