It’s winter and if you live in a climate that requires heating, it’s likely you have low indoor RH. Low RH can result in buzz. Perhaps your tech left your guitar in a very dry location overnight. I think the best approach here is to put a mirror in the sound hole so you can see the ball ends of the string and make sure they are tight against the surface of the bridge plate. Then, leave the guitar in a humidified location and see what happens. If all this fails to solve your problem, bring it back to your tech.
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