No worries, but thanks for clarifying. I actually chuckled when I read your original comment, but that's just me loving snark.
To elaborate on your question, there are SO many factors that can cause a unique bug/crash to happen, for example but not limited to:
- 3rd party software installed on / running on PC
- ISP / network hardware / other units on the network
- Unique hardware configurations
- Unique matchmaking configurations (some people have the weirdest home networks)
- Faulty installations of either game or 3rd party software
- Driver incompatibility / not updated / corrupted
- Admin/OS issues or broken privileges
This does not take into account the fact that a crash/bug can look identical from a user's (or our) perspective, but have completely different root causes in reality.
We QC on a ridiculously wide set of devices, consoles and configurations - but this still only covers a fraction of the possible edge cases. This is why we often work together with people experiencing issues to find a repro together and solve it quicker, rather than guess in the dark.
Hope that shed some light on the topic! :)