I'm using the protobuf API to the Linux binary to transfer files with FILE_REGULAR for downloads and STREAM_TO_FILE_UPLOAD for uploads. The problem is that it will reliably start failing with no available transfer worker after some predictable amount of activity. I'm doing everything in the examples, and even tried explicitly cancelling every STREAM_TO_FILE_UPLOAD transfer after it completes, but it still eventually stops accepting new transfers. Any help would be greatly appreciated; thanks!