I don't quite know how to replicate this, but here's what happened. I dumped a bunch of items into an EZ Storage network. Roughly 14,000 items in total.
Since then, any time I open the network I see a long chain of errors in console. Then I lose the ability to open any GUI, throw items, etc. I suspect the server is frozen.
Then, once I log out, the server crashes.
Crash report: https://pastebin.com/YUmX6agC
Latest.log file: https://gist.github.com/TheDeviantCrafter/0a7874d4babff9a9ed20cd41b1691a0f