Audio Skipping While Streaming OBS/Vimeo

[HPBC129]

While streaming, our live audio began to skip. It's never done it before and we've been streaming about 5 months. The audio comes into our camera from the soundboard and sounded good coming in. The audio out goes HDMI to Blackmagic Ultra Studio into MacBook Pro running OBS and stream is hosted on Vimeo. We checked the pathway in and out and can't seem to isolate a place along the pathway that is troublesome. We are new to streaming so please simplify comments. Thanks