@svenjosh glad to have been of assistance (ie:PLL lock). With some streamer/servers where great care hasn’t been taken (like most most computers and consumer grade products) the PLL lock can be a useful feature. In your case, it is detrimental and based upon your observations, quite audible.
I assume at some point in this process you are going to share the dealer’s name from whom you purchased? Others on this forum could benefit.
Happy listening.