System Information
iMac (Retina 5K, 27-inch, 2017)
OS Big Sur 11.2.3
Processor: 4.2 GHz Quad-Core Intel Core i7
Memory: 40 GB 2400 MHz DDR4
Graphics: Radeon Pro 580 8 GB

Blender Version
Broken: version: 2.92.0 (2.920 2021-02-25)
Worked: (newest version of Blender that worked as expected)

Short description of error
If I navigate away from Blender for a period of time that's circa in excess of thirty minutes the programme crashes upon my return.

Exact steps for others to reproduce the error
1). Do something in Blender and save it - or don't save it... that doesn't seem to have any bearing on the issue.
2). Leave Blender open but navigate away to perform some other task for a while (checking email/working on something in Photoshop etc).
3). Navigate back to Blender after 30+ minutes or thereabouts.
4). Blender will usually then crash/quit as soon as I attempt to do something, like choosing a tool or grabbing and moving an object.