Hopefully the new case will not create the clicking sound on video. Watch this space. Sadly, the clicking sound remains and appears o be conflict between the 2 mics. Chat with Apple allowed a work-around: open the bottom Lightning slot and plug in a set of earbuds, or a mic – this cuts out the bottom mic, so no conflict.
https://www.amazon.com/Lifeproof-Waterproof-Case-iPhone-ONLY/dp/B00Z7SOICG