Don't upgrade for at least 3 months! Had the same problem with UAD previously. Great interface but they aren't always the fastest to keep up with updates. They didn't address the wake from sleep issue for about 6 months and even then it still didn't work properly.
I have a second mac running Sierra and it works perfectly with my Clarett 8 pre. Still, not doing a thing on the main computer until at least December. I have to complete a contract and I don't want to mess with anything.