Macbook freezing when left open and untouched

I have a 6-month-old macbook that has been working wonderfully (besides a glitch that was fixed at the Genius Bar a couple months ago) up until this past week. Recently, whenever I leave my macbook open and untouched for a while, sometimes for just a few minutes, the screen saver will come on like normal. However, when I move the mouse to get back to my desktop, the screen saver disappears and the computer freezes. I don't think I've changed any settings and I can't think of anything that I've been doing differently than before when it worked well. Has anyone else had this problem? Thanks!

Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar

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