You can always check Zapier's status page. If there are issues they'll usually be noted on that page and you'll be able to subscribe to email updates for a particular issue.
Zapier have a very proactive support team and you can reach out to them 24/7. If you're having an issue and you don't see any details about it on the status page (or even if you do), they'll be able to give you more advise and support. You can open a ticket here.
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