I'm trying to use a 1TB Western Digital Passport USB drive on my C59 for backup storage, but the router's SMB server (Windows network share) keeps crashing when I try to copy files to it. It runs for a while, and I get a few gigabytes processed, but after a while the network share simply disappears in mid backup. I have to reboot my router to restore the network share. The router's admin web page is still available, and router and WiFi functions still work. Just the SMB server is gone. Is this a known issue? Is there anything I can do to resolve the issue?