HOW GOOD REAMING PRACTICES PROTECT FROM STUCK PIPES PROBLEMS
Reaming & Backreaming Guidelines
Reaming is a high risk operation which accounts for a large proportion of stuck pipe incidents.  If reaming operations are conducted too fast solids from wash-outs and cavings are introduced into the circulating system at a faster rate than the hole is being cleaned.  This results in a drilling pack off. 
https://www.drillingmanual.com/back-reaming-practices-stuck/