stuthebassman69, firstly, welcome to the neighborhood.

BiaB can commence performing a song before all of the song has been generated. It's done this way so that as soon as enough of the performance is known it can start playing while the remainder of the song is 'constructed' behind the scenes.

Your issue may occur if you attempt to move to a part of the song that has not yet been finalized.

A workaround is to check the Playback Generation item in Song Settings, and see if that makes an improvement.

Let us know if this helps in some way.

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BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones