Unity 5 crashes the whole internet connection

I'm pretty sure I've seen someone complain about this before but I can't locate the thread, or any other mention of this problem or a fix for it.

Launching editor RC3 or RC4 will break the current (wireless) internet connection on my PC. I'm unable to properly connect to any network until I close Unity and restart the network adapter.

Due to this, I can't even deactivate the now redundant pro license.

This has never happened in the earlier 5.0 betas.