Ok, so is the file on your LAN or on the internet somewhere?
If it’s on the internet My method would be;
- to connect directly to my ISP’s router (not going through any corporate firewalls, extra switches, vlans, routers) and try from there.
- Try the download from another location
if it’s on your lan then try one or all of the following;
- with a device connected to the same switch as the source on the same vlan
- move the file to a different disk (maybe the file is corrupt)
- create a 1gb file, download that, make a 2gb file… upto 65, does that break at some point