Version 7.4.4 crashes when using the search function on my iPhone.
If I enter text into the search field, the progress indicator starts rotating and after a few moments, the app freezes completely, so I have to kill the app.
It almost sounds like the update may have corrupted the app. I had that happen a few updates back and had to delete the app and then re-download it. All was good after.
Maybe with a diagnostic code sent after you let it crash and then restart may help Firecore figure out something.