Tank mechanical failure was more common than most people might think.
The engineers got a lack of access to high quality materials for key components when building the tanks.
The bigger tanks were created to overcome the enemy ones of the moment and rushed into the battle in order to win urgent fights without a period of quality assurance and proper testing.
During the battle some tanks couldn’t be suitably maintained due to a difficulty in bringing supplies to the battlefield.
All of this caused the breakdown and the abandonment of many tanks during the war.