Database problem. I have a client where UPS and FedEx will turn off on its own around early morning hours every day.
The only thing we got from XC support when they fixed the issue was
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There were some discrepancies in the store database (in the "xc_shipping_methods" table).
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Shipping was setup from admin to begin with and redone few times in a hope redoing it will remove the problem but it doesn't. I suspect it is an XC issue to begin with but it doesn't happen often or it may be due to environment or some momentum glitch.
Anyway - you probably have incorrect database entries in this table or related ones which will cause the shipping to go off.