Hi spikestarmer,
Thank you for participating in the Apple Support Communities. We understand the Podcast app, Books app and your web browsers are crashing when listening to audio after a certain amount of time, and we'd like to assist. Do you have any macOS updates available?
Update macOS on Mac
Before updating, we recommend backing up and checking the disk for errors.
Back up your Mac with Time Machine
Repair a storage device in Disk Utility on Mac
You may also want to see if the issue occurs when booting in safe mode. This can help rule out third-party software conflicts.
How to use safe mode on your Mac
Take care.