To reproduce:
1) Create a new project on Windows
2) Build it for a Standalone platform as a development build
3) Launch it on a different machine on the same network
4) Connect to the player from the editor in Windows
5) Check the Unity process's memory usage in task manager or similar app

Expected: No change in memory over time
Actual: Memory rises from 800MB to X GB rapidly (for a new project, 1.3GB, but on a bigger project over 3GB cap was seen, at a rate of roughly 50MB/s), then it drops back to 800MB and rises again, repeating the same behavior endlessly.

Reproduced in 2018.1.0b13, 2018.1.0f2, 2018.2.0b3
Not reproduced in 2018.1.0b7, 2017.4.3f1, 2017.3.0f3