iRay restart from iteration 1

Hi ! I got a problem with iRay rendering engine. With some scenes (not all) Iray restart from scratch after some time (randomly it seems).

Here's the log  :

Rendering in NVIDIA Iray
Compiling Shaders - 0/1
Rendering image
Rendering...
Iray VERBOSE - module:category(IRAY:RENDER):   1.2   IRAY   rend progr: CUDA device 0 (GeForce GTX 970): Processing scene...
Iray VERBOSE - module:category(IRAY:RENDER):   1.3   IRAY   rend stat : Geometry memory consumption: 1.16736 GiB (device 0), 0 B (host)
Iray VERBOSE - module:category(IRAY:RENDER):   1.2   IRAY   rend progr: CPU: Processing scene...
Iray VERBOSE - module:category(IRAY:RENDER):   1.3   IRAY   rend stat : Native CPU code generated in 0.00125s
Iray Iteration: 1
Iray :Render target canvas was written.
Iray Iteration: 2
Iray :Render target canvas was written.

[Deleted for clarity]

Iray Iteration: 57
Iray :Render target canvas was written.
Iray: 84.19% of image converged
Iray Iteration: 60
Iray :Render target canvas was written.
Iray VERBOSE - module:category(IRAY:RENDER):   1.2   IRAY   rend progr: CUDA device 0 (GeForce GTX 970): Processing scene...
Iray Iteration: 63
Iray :Render target canvas was written.
Iray VERBOSE - module:category(IRAY:RENDER):   1.2   IRAY   rend progr: CPU: Processing scene...
Iray VERBOSE - module:category(IRAY:RENDER):   1.39  IRAY   rend stat : Native CPU code generated in 7.31e-007s
Iray Iteration: 1
Iray :Render target canvas was written.

 

It appears to happen when I do something else on my computer, like switching windows or tabs, but I can't find any consistency about it. Some scenes that are bigger (in term of memory usage) don't cause this. And I don't do anything too demanding anyway, it's like watching Youtube videos or listening to podcast, browsing internet etc ...

What can I do about it ? I only have one PC, some renders take a long long time, and doing nothing at all on my computer is problematic ^^

Here's my hardware :

i7 7700k

16 Go Ram

500 Go SSD

Nvidia GTX 970

 

Thanks !

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