Gaspar Froze for a few minutes at 3 days 3 hours uptime

Gaspar Froze for a few minutes at 3 days 3 hours uptime. Ram use was above 10GB. It seems there was also a CPU usage spike around the same time, after the system became responsive again. The mouse cursor still worked, but seemed to move slower across/around the screen. I had just opened a youtube video when it happened.