Can you tell us which version you are playing, the device you are using (android, pc, mac), and if you downloaded the version from our official itch.io page (this page)?
We have been trying to fix as many problems as possible, and the Monday loop is hopefully already fixed on version 0.6. I say hopefully because we've been trying to fix that particular problem since version 0.4. We test the game A LOT, we even have beta testers that try every update before it launches, but some of those bugs people report we never encounter during testing, even if we are trying to force them. like going to class on Monday after that quest every single day, on different devices, and after different tasks. We change the code on that particular task, and we also refine code from other tasks. I understand that it is really stressful and stops people from enjoying the experience. We are doing the best that we can to fix every issue that people report. In the meantime, you can skip Mondays after that task is done, which should let you continue with no problems. We are really sorry about that.