"It's an earlier version of this device"....
Meaning my link is the earlier version or your device is an earlier version?
Either way, the link I found was for an already obsolete TV Media player.
If your player is even older or not much newer than the referenced media player, the player is more likely nearing towards or developing EOL (End of Life) problems.
Often preceded by (but not always) intermittent problems. Some devices simply stop - no sometimes copying.
Working sometimes is deemed an intermittent problem and intermittent problems are difficult to discover and/or diagnose.
Source problem could be the power supply, the cables, or the device itself.
For the most part you are limited to trying other video cables. Swap in...