Pauses will stop with correct practice and with planning.
Correct practice means that you slow down as much as it takes until your chord changes are fluid at that speed - that is your "current speed." Now, keep practicing at the current speed, especially the first few minutes when you're "warming up," and only gradually try to increase your speed from there.
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Another big thing is don't try to build the chord a finger at a time. Learn the shapes of the chords as if your fingers were a rubber stamp. As you lift your hand from one chord all of your fingers move together to the shape for the next stamp, then you put them down on the fingerboard pretty much all at once (with some chords you can intentionally hammer on a chord for a desired effect but with practice that should never be necessary.
Finally, the planning part. Some chord transistions are tougher to switch between than others. Look at the entire structure of the song you are planning to play and choose chord fingerings that make the transitions easier, not necessarily the individual chords easier. Song accompaniment is not a set of chords - it is a set of chord transitions. Make the transitions easy!