I too was experiencing this issue on OSX 10.10.2. I watched the system logs and this is the only thing it mentions:
3/8/15 10:41:45.000 AM kernel[0]: Sandbox: Minion(34194) System Policy: deny file-write-unlink /Users/xxxxxxx/Library/Saved Application State/com.zam.minion.savedState/restorecount.plist
3/8/15 10:42:02.000 AM kernel[0]: process Minion[34194] caught causing excessive wakeups. Observed wakeups rate (per sec): 1992; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 45343
The only work around I have found to "fix" this is:
- Click the "cogs" (settings) button in the top right of the window (next to username)
- Click the "Reset Addon detection" button
- Click the "Done" button to close the settings
- Close the entire app by clicking the "X" button in the top right corner of the window (CMD+q causes the app to hang and then requires a manual force quit btw).
NOTE: The recent update (2.1.4-beta4) does fix this, but the above steps are required at least once to clear out whatever the previous version did and actually "fix" it.