Shoulder impingement is one of the more common overuse issues among regular lifters, often developing from imbalanced training rather than any single bad rep.
Balance pressing volume with pulling volume
A program heavy on pressing movements without matching pulling work tends to pull the shoulder into a position that increases impingement risk over time.
Rotator cuff work is prevention, not just rehab
Light, deliberate rotator cuff exercises are commonly introduced only after an injury — including them proactively is a cheap, effective way to avoid needing them reactively.