1.1.3 Patch Notes and Deployment Timeline

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Imahood wrote:

I am having the same issues. It is either the patching process causing downtime, or the patch itself causing people to get booted off randomly. I went from 1-5 minutes of connection drops due to "an unexpected error has occurred" to "unable to connect to patching servers" when restarting the game.

This can't be related to the patch or the patching process, as neither have begun yet. The patching won't begin until this afternoon.
As Bunnu said, this sounds like you're having some connection issues. You could talk to your ISP, or post in the Technical and Account support forum - preferably with a WinMTR output that would help people identify where between your client and the servers the issues are originating. I hope that helps.