I have an issue that I was hoping somebody could help me with. I recently bought a RT-AC68P. I started out with 3.0.0.4.378.4585 and it was working fine but I noticed a strange issue. I have an external HDD attached over USB 3.0 and I have daily backups scheduled to run during the day. After about a week or two of the backups running properly, I started getting sporadic access denied error messages. It would often try again a few minutes later and succeed. I had assumed it was my backup program (Acronis) since I have had issues with it in the past, but then I had the issue happen to me while trying to manually access a share on the router using Windows 7. To try and fix it, I switched to 378.52_2, but I am experiencing the same issue. I tried upping the number of concurrent users to 10 but that didn't help. My HDD is a WD Elements Desktop drive which automatically shuts down after 10 minutes of inactivity. I thought maybe that had something to do with it, so I set the router to spindown the HDD after 10 minutes so I could see in the log when this is happening but whether the drive is active or sleeping doesn't seem to have any affect. Even when I have reproduced this myself in windows, waiting about 1 full minute and trying again will work. Any ideas?