SR MBP freezes intermittently.

Hi,
My SR MBP freezes occasionally. Te only option is to hold the power button until it restarts. My wife has had to remove the battery to get it to restart - twice.
I've tried using the disk utilities and no hardware problems were reported. How do I 'repair permissions'? Is that likely to help?
Any suggestions? There does not appear to be a common cause of the crashes.
Thanks in advance.

One thing to check is the battery itself, and make sure it isn't swollen or distorted and exerting pressure on the trackpad from below. I believe the battery runs hotter when the Mac is on battery alone, and this might possibly be a factor.
Good luck!

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