My bold beast pro on my Samsung Note 20 ultra 5G stops recording my calls at about two and a half minutes.
Bold beast pro version is 14.9 GP
Most likely your phone killed the app.
Some phones kill apps when they think they should do so, for example when the battery is low. For more information please see [002] in this page http://www.boldbeast.com/android/call_r … oting.html.