This is something that never gets old to me - seeing other experienced devs playing guessing games instead of instrumenting the problem thing and walking through it step by step.

That’s not to say that you can’t guess the first, or second place to look, but that’s where it should end.

The second thing I see often from smart devs is that they find some bug, assume it’s the one they came looking for and declare victory.

The third is the worse by far, which is to blame the cloud provider/vendor for all issues, especially you not reading their documentation.