Maybe for a long time, you think you are an experienced debugger, you judge that the wrong way is also dependent on analysis and measurement into experience and intuition. But technology always makes progress, and people must progress.
I have listened to a "master" that he rarely uses the oscilloscope now, and can use the multimeter of the multimeter.
The problem occurs and the cause of the problem is much. The key is to find real reasons as much as possible, find the reason and prove that this is the reason, not his subjective guess, of course, guess is the beginning, but it is necessary to prove that the speculation is correct or wrong.
If the interrupt signal is measured, the oscilloscope should be used to use.
