.. audio is not like Video, it needs to be a-little-bit longer in each cut. ( front and back )
Video can be sliced to the nearest frame. Audio has frames to, we just don't see them.
Sometimes, when we least expect it, we've cut-off part of the audio framing and nothing
seems to like-up anymore. Simply add a second or two to each side of the Video Clip and
you'll be fine.
Normally you should add something to the back & front of the edited are for Merging anyways.