Can I diagnose why Blender keeps crashing?

Hi there - Need some help please.

Blender was running fine albeit slow on my Mac of fairly low spec. It now keeps crashing after every few minutes and I don’t know why - It started behaving this way when I used a material from texture haven but have used plenty from there before with no problems. I have updated everything on my Mac and updated to the new version of Blender, too.

It’s really frustrating - is there any way to diagnose what’s going on?

Radeon Pro 560 4 GB
MacOS: 10.15.6 (19G2021)
MacBook Pro (15-inch, 2017)
Processor: 2.9 GHz Quad-Core Intel Core i7
Memory: 16 GB 2133 MHz LPDDR3
Graphics: ntel HD Graphics 630 1536 MB