I've built a base next to the water. I've been playing Survival mode on normal difficulty and had little to no crashing until the latest Snapshot 18w11a. This save file was created during 18w09.

The game crashes randomly very frequently all at once when digging in a mine area and now next to trees. Since my base and mine is next to water, there is potential for Drowned mobs to spawn. I've looked into the crash logs and they all mention the Drowned mobs. The description reads "Ticking entity". The crashing seems to have stopped once I go into Peaceful difficulty.

I'm not entirely sure how to read the crash logs, but I will provide a few.