There is no obvious trigger.
Every so often the model is displayed with a lot of lines and it is unusable.
Exit/relaunch Rhino 7 does not resolve the issue, but so far a reboot always does.
I am using MacBook 2.4 GHz 8-Core Intel Core i9, AMD Radeon Pro 5500M 8 GB
Intel UHD Graphics 630 1536 MB, 32 GB 2667 MHz DDR4, 14.2.1 (23C71)
I will email 2 files showing “with and without problem” to the support email address.