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Thanks for posting, kevin-wong.
We have a reported case about the error Something’s not quite right. Unexpected token < in JSON at position 0. Rest assured our engineers are working on getting this resolved.
In the meantime, I recommend contacting our Customer Care Support to get you added to the list of affected users. This way, you'll be notified whenever an update is available.
If you need some additional resources for QuickBooks Online, please check this link: Help Articles for QuickBooks Online.
I'd be glad to assist you further if you have other questions. Have a good one.
If I were to rest for as long as it has taken to fix this bug, I'd be dead.