Pretty sure this is straight-up TCP behavior, possibly combined with trying to send large files inside the TCP connection via the Citrix protocol. If you consi

Pretty sure this is straight-up TCP behavior, possibly combined with trying to send large files inside the TCP connection via the Citrix protocol. If you consistently lose some percentage of packets for a while, the TCP connection can drop. The file transfer doesn't have auto-resume built in because it operates at a very low level.