I've been pretty vocal recently over my move to Amazon EC2 and switching to LEMP stack and then switch to a LEPP stack. This has certainly seen some great improvements in speed, traffic, and Google indexing. Unfortunately as many of you may know who run their own dedicated server, it's not all white sandy beaches and beautiful sunsets! When something goes wrong, it's up to you to fix it.
So far the only issue that I see keep cropping up is my Mysql database seems to crash every several days. From what I can see, it appears to be a lack of memory issue – it appears my EC2 server is just shy on a bit of memory.
At this point, I don't think it's worth upgrading; instead I've built a simple Mysql uptime script that will ensure it's always running for me.