strange fireflies

Corona Corona for 3ds Max Help Required
1

Any clue why this happens?
When column touches the ceiling I have those strange fireflies occur.

2

round corners?
Singles planes? If so add a shell modifier.

3

Does your walls has thickness?

https://coronarenderer.freshdesk.com/support/solutions/articles/5000516209-i-can-see-noise-in-the-corners-of-my-scene-

4

Yup, my guess would be rounded corners or object intersecting with ceiling without thickness.

5

Sweet! That was easy fix!! Thanks guys!

Surface was a plane, adding shell modifier worked indeed!