Voice Memo stops 5 mins into message when listening

Thank you for your reply. This issue has been going on with my iPhone for a few years. My friend's iPhone is the same. I recently bought a new iPhone 12 pro max and still have the same issue. I reviewed your suggestions and none could resolve the problem. Seeing as my iPhone 12 is only 2 weeks old I did not feel a need to uninstall and reinstall the voice memo app (and lose a few of my stored recordings). Today I listened to another recording my friend sent me (which stopped about 1-2 minutes in....the memo length doesn't seem to matter) and I watched the screen start to dim and eventually went black. The recording and the app closed immediately. I realized this does not happen on the iPad, because my iPad screen never goes dim or turns black. Now if I periodically stop the recording for a few seconds, then start it again, I get a longer listening time....but I have to pause the (incoming) recording periodically. Now....if I make a voice memo on my phone and listen to it before I send it out, then the phone will continue to play the entire recording, even if the phone screen goes black!! Maybe there is a way to fix this in settings but I do not know what it is. It's truly frustrating and annoying.