When using 'sim' in a for loop in accelerator mode I get an 'accelbuild' error after 5,6 or sometimes 18 iterations.

I am doing a Monte Carlo simulation of a simulink model with Matlab 2015b using the sim command

SimOuts = sim(ModelName, 'LoadExternalInput', 'on',...
                         'ExternalInput', 'SimIns',...
                         'SimulationMode', 'accelerator');

Unfortunately, after several iterations of the model running fine, I get

Error using accelbuild (line 50)
Problem creating Accelerator MEX file for model
'my_model'.
 To see the build output, use
 set_param('my_model','AccelVerboseBuild','on')

Error in run_test_harness (line 6)
accelbuild(ModelName);

Caused by:
      Error using accelbuild (line 50)
      Unable to write file
      C:\Projects\my_project\work\slprj\accel\my_model\compileInfo.mat:
      permission denied.

Last night it occurred on the 18 iteration. I don't get how it runs and builds fine 17 times and then has some permissions error on the 18th.

[Chinmayi Lanka]

What kind of blocks do you have in your model? I tried a similar workflow with the example model 'vdp' and had no issues.