Random crashes when calling functions from a dll

I am experiencing crashes of Matlab when I call functions from an external dll (with calllib). What is especially weird is that all of these functions causing crashes actually work... from time to time. When I run my script containing the calls to functions, it can crash at one point, then I run Matlab again, run the script with the exact same input data, and it crashes at another function call, or even between function calls! There is no obvious crash pattern.
I cannot attach the dll itself but here are the header file and the script containing the calllibs, if it is of any help.

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R2015b

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