Why can the sphinx sometimes search and sometimes not search for a result for the same query?

Question

Sphinx

Hello!
There is a search query at one moment there are results for it, at another it is not. Why can this be?
Can the quality of the search load on the sphinx?

Answer 1

put it on the counter
here the problem is that your architecture is unknown, including request preprocessing, so you can guess a lot
counter, logs, you will see a pattern

Answer 2

Well, there is no magic, just look at the logs to understand where you lied