Unable to load files to Sony HAP-Z1ES thru network



I’m having difficulties transferring files—pretty much anything about 96kHz/24bit—into my Sony HAP-Z1ES through a wireless network. Typically, a few files will transfer, but then I’ll get an error message (in the Sony transfer app) saying a file can not be found. The transfer then stops. Any advice is greatly appreciated.


lepanto
I also have Sony HAP-Z1ES. I copy music files directly from Windows file manager without using the Sony Music Transfer program. Transfer using wireless is always slow, but transfer using wired connection is faster, up to 25 MB/s.
I do not use the Sony Music Transfer program with my HAPZ1ES, I use Windows explorer and just drag and drop.  I also upload the files to the Sony in batches, about 20GB at a time and never had any problems, lock-ups or otherwise.  It is not adviosed by Sony to upload large amounts of files via the wireless, Sony recommends the ethernet connection and to use the wireless for adding new files, once the big initial transfer has 
I have a HAPZ1ES and have used windows explorer to transfer music files. I  Have never had a problem. But I have never downloaded a huge file dump. Have never had a problem with any file corruption on the unit. These days I use a external disc drive to rip cd’s directly to the unit.