crash involving ucrtbase.dll

I'm running python scrip multithreading calling a "raster image producing software(64 bits)" (developed in Visual Studio) machin with xeon processor 10 cores with 72 GB memory running 64 bits windows 10 pro. Program open vector data and raster data to produce new raster maps coverage 2400x3200 meters, processing one locale comunity of norway each time. If running production of more than 2 of the largest area at same time in parallel map-software crash. Monitoring process in Task manager there is no indication that machine is anyware close to its limits each map-software using max 6-7 percent of processing capacity and use of memory at max around 40 percent. Programs terminate after running parallel in production of rasters for a while 1 - 2 hours. Error log on windows indicate: Faulting application path:(map-software) and Faulting module path: C:\Windows\SYSTEM32\ucrtbase.dll , Exception code: 0xc0000409, that is stack overflow. IT-team have updated to newest c++ distributable, and map-software have been re compiled increasing stack size from 1 - 4MB. No effect. Any sugestion to solution?