Whirlpool duet dryer makes loud thumping noise while drying?

My whirlpool duet makes thumping noise while drying. Would like to review past posting answers with same issue

Dryer thumping is usually the drum rollers, roller axles or possibly bel delaminating.
It could be a bad bearing or a flat spot on the roller where the rubber deteriorates and chunks off. Check this link.
Whirlpool Dryer Makes Noise - Model WED8300SW2 - Repair Parts - RepairClinic.com (http://www.repairclinic.com/RepairHelp/How-To-Fix-A-Dryer/10-5-697026-/Whirlpool-Dryer-makes-noise-WED8300SW2).