Devialet weird sound

[jacob]

I have an Apple TV. When navigating the main menu icons, it makes small navigational sounds. This is by design.
After stopping navigation and waiting for some seconds, the right speaker makes a small "click" or "puf"-sound.
It seems to be related to the sound stopping, every time I stop navigation. It is kind of annoying.
The left speaker does not make this sound.

My setup is tv -> optical -> left phantom -> wifi/plc -> right phantom.
It could be due to the left and right phantom being different hardware versions, but it is not easy for me to switch optical to the right to try it out.

I am running latest DOS.

Would it be difficult to swap the speakers over and see if the problem moves/changes?

Both Phantoms are mounted on a wall with geckos, the left retrofitted with an optical cable in the wall, when Dialog + PLC was phased out. Both the power cord and the optical cable has a fixed short length, in order to not look sloppy. The power cord is relatively easily attached after the phantom is wall mounted. The short optical cable on the other hand is extremely difficult to attach. It almost needs som especial tool and one should be extremely carefull not to damage to optical jack with the tool, since replacing the optical in the wall is a huge pain. Thus, unfortunately, my phantoms has gone from easy mount and dismount with power cables only, to not so easy, so I'd rather not switch.