So the Issue is that:
- the Shredder sometimes outputs Tiny Copper Dust quickly followed by 72nd Copper Dust
- which then gets stuck in its Filter, since it tries to turn 72nd into Tiny Piles
- which means its Filter will not reset until enough 72nd Piles arrive at that Mass Storage to make a whole Tiny Pile.
- and typically that Shredder wont output enough 72nd Piles for it to ever do that, so it’s stuck forever now.
The Inherent Flaw in your Design is that you do not take account of the Mass Storages intentionally piling up Dusts, which in case of your Shredder, will basically always get you stuck with your Design.
The Roaster does not get Stuck because it always outputs the same Size of Dust no matter what, since its Recipes always have the same Output Pile Size.
To solve this Issue in your Setup, replace the Mass Storage below your Shredder with a GT6 Hopper that has 5 or more Slots. That will fix it and keep your Setup running as intended.