Intermittent Failure to Wake from Hibernation

[c5f]

System Info

• OS X 10.10.3
• YoNTMA Mac version 1.0.1
• MacBook Air 6,2 (April 2014) 1.7GHz

I run two user accounts on this machine:

1. User 1..
   • has FileVault unlock privileges. 🔐
   • is an administrator.
2. User 2...
   • does not have FileVault unlock privileges. 🔒
   • is an administrator.

When waking my machine from hibernation, sometimes the machine is completely powered off. After pressing the power button to wake the machine, it makes the POST boot noise and dumps me back into User 1's account instead of resuming the session that should have hibernated.

Other things I have noticed...

• This is less likely to happen if I use Fast User Switching to open the Login Window before hibernating my system. 👤
• This is less likely to happen if my machine is sleeping for a short amount of time (more than an hour and I expect a fresh boot).
• This happens from both User 1's and User 2's accounts on hibernate. 💤
• This has been happening since I got this machine in February (I don't know which version of Yosemite).

I have no idea where to start digging in system logs to see if this is a problem with YoNTMA or another piece of software on my system, but I would love to help in any way that I can. I'm hoping that someone else has had this issue - I didn't see anything related in the repo issue list here after 4 months of consistent albeit intermittent behavior.