Error polling heartbeat

Pretty frequently when I start up jupyter fresh, I get the following kernel failure when trying to run the first cell

```
[I 15:29:13.975 NotebookApp] Adapting to protocol v5.0 for kernel 013d8be1-ffe1-468f-8e1c-d4f84f464043
2018/06/28 15:29:15 Error polling heartbeat channel: interrupted system call
```

The full log from the session is the following:
```
brendan:~/Documents/mygo/src/sfi/reujae$ jupyter notebook
[I 15:29:09.813 NotebookApp] Serving notebooks from local directory: /Users/brendan/Documents/mygo/src/sfi/reujae
[I 15:29:09.813 NotebookApp] 0 active kernels
[I 15:29:09.813 NotebookApp] The Jupyter Notebook is running at:
[I 15:29:09.813 NotebookApp] http://localhost:8888/?token=9fed7ddd6f148b87664b9cd09e15f181c04fa5cb7c511cee
[I 15:29:09.813 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 15:29:09.814 NotebookApp]

Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
http://localhost:8888/?token=9fed7ddd6f148b87664b9cd09e15f181c04fa5cb7c511cee
[I 15:29:10.055 NotebookApp] Accepting one-time-token-authenticated connection from ::1
[W 15:29:13.388 NotebookApp] 404 GET /nbextensions/widgets/notebook/js/extension.js?v=20180628152909 (127.0.0.1) 14.12ms referer=http://localhost:8888/notebooks/PCAExample.ipynb
[I 15:29:13.841 NotebookApp] Kernel started: 013d8be1-ffe1-468f-8e1c-d4f84f464043
[I 15:29:13.975 NotebookApp] Adapting to protocol v5.0 for kernel 013d8be1-ffe1-468f-8e1c-d4f84f464043
2018/06/28 15:29:15 Error polling heartbeat channel: interrupted system call
```