Thanks again,
He has now reinstalled Windows and Tune Browser. And also set the callback timeout to 15000 ms. In addition, the memory cache for reading file was set to 8000 kB.
And it continues to work (for now?) without disruptions. There is now a small problem with max sample rate (it is now 88.4, while 192 is desired), but we think this is a setting.
All this effort is worth this wonderful software. He went back to JRiver for a while and then Roon, but in terms of sound quality, TuneBrowser is far superior. Thanks for that too.