saddle/brace buzzing?

hi I'm new here, and i've been playing for a couple of months.
i've had a Lanikai LU-21C concert for a couple of months now, and it seemed to work fine. I noticed that once the colder weather set in, the thing started buzzing like crazy. I took out the saddle, and took a look at it, but nothing seemed to be wrong. How can i fix this?

Are you sure it's a brace or a saddle? Buzzing can sound like it's coming from all over the place when it could be fret buzz or even something loose on your headstock.

I would first check any electronics. If you have a pick up, there are wires and the input jack that can come loose and make some loud noises. If you can't find it, it may be any loose glue joint anywhere at all, best addressed by an expert. Could be a crack has grown sufficiently to cause a buzz when the two sides of the crack move in opposite directions, or one side moves and the other doesn't. If it isn't something easy to find, go to a professional.

Check the big nuts on the tuners as the headstock will shrink with cooler dryer weather. Makes a heck of a sound.