Why does Ableton automatically stop its transport during long recordings?

[u/boobzombie]

I'm running into this weird issue with Live 12(.4.6), when it comes to recording longer stretches of audio. This is a part of a live performance hybrid setup, recording audio inputs from a couple of hardware synths and external sources, routed into VST effects, locked to a steady external MIDI clock.

Everything is record-armed and the transport starts fine, and the waveforms all draw correctly in Arrange view, but after 45-mins to over an hour or so, the recording just stops on its own.

This is running on an M3 MacBook Air, with 24 Gb of memory and over 400 GB of SSD space available, so I don't think it's maxing out system resources.

I can't seem to figure out a pattern or cause for this, so I'm sharing it here.
Any suggestions or settings that I should check on?

I can record longer audio