First, try to download a smaller amount, so that when the network fails, you don't have to start from zero:
Taken From This Answer by ingyhere
First, turn off compression: 
git config --global core.compression 0
Next, let's do a partial clone to truncate the amount of info coming
  down: 
git clone --depth 1 <repo_URI>
When that works, go into the new directory and retrieve the rest of
  the clone: 
git fetch --unshallow 
or, alternately, 
git fetch --depth=2147483647
Now, do a regular pull: 
git pull --all
I think there is a glitch with msysgit in the 1.8.x versions that
  exacerbates these symptoms, so another option is to try with an
  earlier version of git (<= 1.8.3, I think).  
If this does not help, because your network is still too unstable or your repo still too large, try a different network - best would be a wired.  
For me, that was not an option. VonC's Answer states to do git config --global http.postBuffer 524288000. Maybe you'll need to do git config --global https.postBuffer 524288000 instead, if you're using https.  
Finally, what worked for me in the end:
Give up and use a different machine
If it works on your laptop, just pull that repo onto your laptop, then run
git bundle create /my/thumb/drive/myrepo.bundle --all  
And restore it on your other machine with
git clone /my/thumb/drive/myrepo.bundle