Render stop

[imago10]

Hello I have problem when I render in picture viewer sometimes my render freeze and doesn't calculate anything. In log I have that error (2x1080ti WC). I use W7 64bit and C4D R19. What this error means? (nvidia drivers: 391.35).
Also I see that this error occurred more when I use displacement maps (but I still have about 4GB VRAM free on cards).
Thanks for help

Started logging on 20.04.19 12:44:02

OctaneRender 4.02.1 (4020100)

CUDA error 700 on device 1: an illegal memory access was encountered
-> failed to wait for event
device 1: path tracing kernel failed
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to wait for event
device 0: path tracing kernel failed
CUDA error 700 on device 1: an illegal memory access was encountered
-> could not get memory info
CUDA error 700 on device 1: an illegal memory access was encountered
-> could not get memory info
CUDA error 700 on device 0: an illegal memory access was encountered
-> failed to unregister pinned memory
CUDA error 700 on device 0: an illegal memory access was encountered

[aoktar]

Looks like hardware problem. Decrease gpu frequency, use latest builds.