How to fix:
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1. Increase the extruder temperature to keep the flow of filament more consistent and allow the material to melt and solidify together with other layers.
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2. Decreasing the printing speed gives the hotend more time to melt the filament which makes bonding between layers better.
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3. A clogged nozzle can also cause separation by decreasing the filament flow rate. Cleaning your nozzle every once in a while should help.
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4. Keeping the layer height low is also known to ensure better layer adhesion, eliminating this issue.
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5. Make sure your filaments are dry.