Log flooded with coreaudiod errors

We have a text based thunderbolt3 driver for our audio device.
The CoreAudio plug-in works well, but we noticed that the log is flooded with error messages from coreaudiod.

we have this sequence repeatedly,- it seems to come at least once for every call to GetZeroTimestamp in our plug-in:

.....
IO_Sender.cpp:177   Failed to send io sender message id 5, need to resynch
IO_Sender.cpp:202   Successfully resynched io sender/reciever
IO_Sender.cpp:177   Failed to send io sender message id 7, need to resynch
IO_Sender.cpp:202   Successfully resynched io sender/reciever
.....

Does anybody know what this is about?