Zardnaar
Deity
The factory cut corners in order to meet production qoutas. Some of it made sense like the prototype had rubber rim wheels, given the rubber shortage these were cut from the production model
But they cut important things like steel hardening process for internal parts like the final drive, removed sealent from hatchs which meant water got inside, insufficent welding might be a skill issue, it was not a joke when they considered T-34s almost like a one use weapon, good for one battle due to the unreliability at the manufactoring stage
Issues like the high death rate of Russian crews were identified, to the ammunition storage in the turret ring and the engineers worked out solutions with ammo racks. But these improvement were held back by stalin to keep production numbers high
Even better couplas for viewing were ignored only highly decorated tank aces were premitted to voice these sortcomining to higher command and ask for fixes.
2022 they still haven't fixed exploding ammunition problems going by the T-72 turret throwing Olympics in Ukraine.