I had the same issue on a Mac Mini 2018 with 8GB of ram. Ram usage was always high with everything that was open at the same time (xcode, web browser with huge amount of tabs, android studio, ...). After upgrading to 32GB of RAM I haven't had this issue again (yet?). So it seems related to available RAM, even if this should not crash the whole machine, so Apple needs to fix this ...
When I had 8GB of RAM I found that closing everything I could close to liberate some RAM would mitigate the issue, and prevent it from happening too frequently. Another thing thats seemed to help was to use iPhone SE Simulator (even with last iOS version), maybe since it uses less RAM.
P0Ps
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I had the same issue on a Mac Mini 2018 with 8GB of ram. Ram usage was always high with everything that was open at the same time (xcode, web browser with huge amount of tabs, android studio, ...). After upgrading to 32GB of RAM I haven't had this issue again (yet?). So it seems related to available RAM, even if this should not crash the whole machine, so Apple needs to fix this ...
When I had 8GB of RAM I found that closing everything I could close to liberate some RAM would mitigate the issue, and prevent it from happening too frequently. Another thing thats seemed to help was to use iPhone SE Simulator (even with last iOS version), maybe since it uses less RAM.