Quad tiled artifacts on the renders

[Erifer]

Hello, I have got some strange issue, as I heared it is usuall problem, but didn't find the solution. Usually on 16 semples, 8 antialiasing, 3 shadow, 5 rb - I didn't have problems, but im my current project I have tiled quads artifact and I cant fix it without semples 64+ in options and I have not time to wait one week to render it. Please help me.
Example:

Windows 7
Keyshot 7.2
Blender 3D

[Erifer]

Solved, ground plane have to be disabled.