Unreal engine 4.20.2 suddenly freezes whole macbook

Whenever I open a second Unreal engine 4.20.2 editor my whole macbook freezes and is not responding. I have to hard reset it.

I used to have no problems opening multiple editors with 4.20.2.

Macbook pro specs :

MacBook Pro (15-inch, 2017)
2,9 GHz Intel Core i7
16 GB 2133 MHz LPDDR3
Intel HD Graphics 630 1536 MB (also sometimes use the eGPU Gigabyte radeon rx 580 8GB)


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