Lightmass kills tasks for no reason

tried everything. render stops at some seconds in
.NET updated

:47:07: Processing…
13:47:07: EmitDirectPhotons complete, 0.015 million photons emitted in 0.1 seconds
13:47:07: EmitIndirectPhotons complete, 0.039 million photons emitted in 0.1 seconds
13:47:07: Marking Irradiance Photons complete, 0.017 million photons marked in 0.0 seconds
13:47:09: Caching Irradiance Photons complete, 0.193 million cache samples in 1.5 seconds
13:47:09: Calculate Irradiance Photons complete, 0.010 million irradiance calculations in 0.3 seconds
13:47:10: Lighting 10.3%
13:47:11: Lighting 20.7%
13:47:11: Lighting 31.0%
13:47:12: Lighting 41.3%
13:47:12: [UpdateTaskState]: Task Rejected locally by PC-ART14, counted as failure
13:47:12: [Job] Job has failed! The task failure count is non-zero
13:47:12: [UpdateTaskState]: Task Rejected locally by PC-ART14, counted as failure
13:47:12: [UpdateTaskState]: Task Rejected locally by PC-ART14, counted as failure
13:47:12: [UpdateTaskState]: Task Rejected locally by PC-ART14, counted as failure
13:47:12: [UpdateTaskState]: Task Rejected locally by PC-ART14, counted as failure
13:47:12: [UpdateTaskState]: Task Rejected locally by PC-ART14, counted as failure
13:47:12: Lightmass - Rejecting task (00000000000000000000000000000B47)!
13:47:12: Lightmass - Rejecting task (00000000000000000000000000000B4C)!
13:47:12: Lightmass - Rejecting task (00000000000000000000000000000B4B)!
13:47:12: Lightmass - Rejecting task (00000000000000000000000000000B48)!
13:47:12: Lightmass - Rejecting task (00000000000000000000000000000B46)!
13:47:12: Lightmass - Rejecting task (00000000000000000000000000000B49)!
13:47:12: Lighting 50.2%
13:47:12: [CloseConnection] Closing connection 0B264969 using handle 0B264969
13:47:12: [CloseConnection] Connection confirmed for disconnection 0B264969
13:47:12: [CloseConnection] Closing orphaned Job (06DCECBB-4DAE8F31-EFE1F2B1-D0F9FFFB)
13:47:12: [CloseConnection] Orphaning local connection (0B264969 is the parent of 46613280)
13:47:12: [CloseConnection] Connection disconnected 0B264969
13:47:12: [GetMessage] Safely returning to 0B264969 with no message

We have a similar problem. Memory goes to 32 GB (my physical amount) and then crashes.
It’s not even a complicated scene…
//Mattias