Ipfs cat file make my network stuck


I am exploring ipfs on MacOSX. I find when I use ipfs to cat some file it will cause my network connection broken.
For example I just tried ipfs cat QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt. Then my network stuck, I have to turn off wifi and then turn it on to make connection.

The hash value is got from ipfs boostrap, I just want to see things included in the bootstrap files.