Couchbase Server Crashes After Using Sometimes

In my local machine (macOS Mojave, 8GB 2133MHz LPDDR3, 2.3GHz Intel Core i5) since I’ve installed and been using couchbase server 5.1.1, the cb server crashes after using it for sometimes. There is no specific amount of time. I assume when the cb gets some amount of hits. But I can assure I do not use it extensively (its local, right?). And when it does crash, my laptop produce huge amount of heat unless I quit the server and start again after it cools down.
Here is my server configuration - Data Service 2000 MB, Index Service 256 MB, Search Service 256 MB. I have only one bucket which I use.
Is it happening because of some misconfiguration? This crash thing also happened 2 times in my demo server too and I had to increase the server capability.
Any help would be really appreciated! Thanks in advance.

Here is the cbcollect info