Steps to reproduce:
1. Download and open attached project "Flickering.zip"
2. Open scene "First" and move around camera in scene view
3. Actual result: Notice, that at certain angles plane starts to flicker (see: https://gyazo.com/6c09f56dd5d282e30edc2110af84f00e)
Expected result: No flickering, regardless of the angle

Note: Disabling object "floor_5_det_2" fixes the issue.

Reproducible on:
Windows 10
Unity 5.2.4p1, 5.3.0p1, 5.3.1f1, 5.4.0b1

Not reproducible on:
Unity 5.1.4f1

Workaround: switch off deferred reflections ("No support" in graphics settings). Or not use negative scales.