Hey mattit,
We understand that you're running into issues with the Voice Memos app not working as expected when you try to edit voice memos. We'd love to help.
Are you using the steps under the "Edit a voice memo" part of the following page to edit your voice memos? Use the Voice Memos app
Which model of iPhone do you have, and which iOS version is your iPhone running? Find the software version on your iPhone, iPad, or iPod
Prior to the Voice Memos app quitting or not responding, do you ever see an error message? If so, what does the error say? Do any other apps quit unexpectedly?
If apps are quitting or not responding as expected, these steps may help: If an app unexpectedly quits, stops responding, or won’t open
Thanks!