Random crashes on build (Unity 2019.4.8f1)

For the last few weeks we've been experiencing some crashes that happen only when testing our builds (never while playing on the editor) at seemingly random times, with an error message that only says "Attempt to access invalid address". It may crash just after a few seconds or may not crash even after playing for hours.

At first I thought the crash was related to the shadow settings as the first error messages seemed to show the crash happened while Unity was working on the shadowmap, but after fiddling with the settings we still got crashes in different rendering functions. We also updated the editor a few times (it started happening while we were on 2019.4.6f1 I think and now we are on 2019.4.8f1) but it didn't seem to help.

I would really appreciate if anyone knows where the issue maybe coming from or can point me in the right direction!

This is the error message.

This is sample call stack from on of the crash.dmp.