Random crashes?

In my past 2 games I have had a random crash at the same time as other players on my team. In happened at random intervals making the client freeze up than close. All the people playing were on different wifi, and all 3 of us that experienced the crash at the same time were on Macs. This has now happened 3 times to me, twice today on normals and once last night on urf. The one on urf happened with me and a player on the enemy team both crashing at the same time. I am wondering if it is a bug in my client or something else? And is there anything I can do to try and prevent it?