Interior. lot´s of GI splotches.

Looks like you've some light interpolated into the irrmap.
Please check that the options named Interp. lights in IrrMap are both UNchecked.

Hope it helps !

ok noticed.
You can correct that by yourself :

click on edit (edit preset) to modify the preset

The preset editor will appear : give it a new name (see on bottom of the window)

Make changes like this :

by default the irrmap min and max values are :
-4 -1 for medium and -3 -1 for prod settings.

You can change by :
-4 -1 for medium and -4 -1 for prod.

It will allow Vray to avoid placing too much samples on flat areas, even in High quality modes

Hope it helps !