Every dip (even the small ones) in this image is every time the server hung up, crashed and restarted. Most of this was due to the fact that the server had been running out of RAM and physical disk space.
As seen in the same image, it was March 7 that the admins decided to double our RAM and physical disk space by going to the next tier. What used to cost $6 per month now costs $12 per month to operate our server.
I have a bot that sends me an email every time our server goes down. I was getting 3-4 of these per day before the upgrade. Since the upgrade, I have not received one.