Overhead
Your Shoulders Are Unstable Through Range
The fault
Shoulders that hold a static position but give out when the position has to move.
Why it happens
Strong shoulders and stable shoulders are not the same thing. Stability is about holding a good position while moving through appropriate patterns, which is exactly what the lifts demand.
The fix
Grab a band and run the drill in the video. It rehearses a solid overhead position through movement rather than just at a standstill.
About this fix
Originally published as "Simple Shoulder Stability" on 13 June 2016, part of The Lifting Fix, a free weekly weightlifting technique series Danny Lehr ran from June 2015 to December 2016. Every episode is free here and always will be. For the full structured course, see the professionally filmed program.

