Good morning, everyone! I've got an early 2011 base model MBP 15". She's always served me very well, but in the last two weeks, I've had to reset the NVRAM twice due to it completely freezing and becoming nonfunctional even with regular reboots - something I've never had to do in all the years I've owned her. I use Charlene mostly for Office, web browsing, coding (Python and Java with Jupyter Notebooks), Slingbox viewing... nothing I would consider super intensive. I have a new battery, SSD, and 16GB memory ready to install this weekend an effort to hold off buying something new. I'm currently running Mavericks 10.9.5 (will install El Capitan on the new SSD) and I keep it as clean as possible (physically and digitally) - but what gives? Thanks!