DVR records but fails to play

I've had an issue over the last week where the DVR will record or start recording shows, but the playback will not start.

I can tell when this is happening as the preview window is blank when looking at the recording:

and then when I start a recording, the time says 0 and the pin wheel spins with a blank screen:

Only way I can get it to work again is to restart my mini, but that kills off any current recordings

If this happens again, visit http://x.x.x.x:8089/debug/stack and email the output to [email protected]

Will do.

happened again will send you the logs.

2017/02/11 23:33:57 [ERR] Could not create backup: mkdir /Volumes/Video III/DVR/Database/backup-20170211.232351: resource busy
2017/02/11 23:35:38 [DVR] Error running job 1486873800-ch588: open /Volumes/Video III/DVR/TV/Super Bowl Classics/2017-02-11-2330 Super Bowl Classics 2012-09-03 XLVI New England Patriots vs New York Giants.mpg: resource busy

Something’s up with the disk. Creating directories and files should never fail, but are returning “resource busy” errors on your setup.

What filesystem is the drive formatted as? What version of macOS?

It’s a new drive I bought to use with the DVR.
It’s a Seagate drive over USB, running HFS+ on 10.11.6.