Which port goes to which cable? I have the same setup as well with the cetra at the bottom port and the charging cable at the side port (near the vent) and i have no issues with audio nor charging. Actually, i can just use either ports and still have no problems.
I don't use an adapter but when i use the fan and plug the cetra in it with the charging cable on the bottom port, that's the time i get connection problems, in this case, i just swap the cetra and the charging cable and it's back to normal.