Potato wrote:
"The problem only occurs during sleep. It works flawlessly when used and if you never sleep then it will stay mounted forever."
Once more, I'm going to offer my "Fishrrman's sounds like a broken record" advice.
If you have problems that seem to be "sleep related", the best solution is:
Never put the thing "to sleep".
Go to the energy saver pref pane and set computer sleep to "never".
Set "display sleep" wherever you wish.
UNcheck every other option below that.
Now, just "let it be".
The difference in power consumption between "idling" and "sleep" has become negligible with the introduction of all-SSD configurations. Just a couple of watts-per-hour. You're not gonna "save the environment" by using sleep vis-a-vis not using it.
At night, just shut it down, and reboot in the morning.
Nothing like "a fresh start" to clean out the cruft.
I even go further:
When I'm going to be away from the Mini for a few hours, I "reach forward" and TURN OFF my display.
When I sit back down, I reach forward once more to turn the display on, then click the mouse.
Everything "comes right back" as it should.
No "sleep problems" here.