Hello @one-tik sorry to hear you have expereinced crashes and FPS drops since the last update.
In order to try and resolve this issue or narrow down a few possible things that may be causing it, could you please follow each step you have yet to try in our tech troubleshooting guide? This guide contains the most common fixes for crashing issues and both performance-related issues like FPS drops, it will help rule out if it was caused by hardware, software, corrupted file, Windows settings and out-of-date drivers > https://www.ubisoft.com/help?article=000061047
We always recommend using the latest Windows Update for security reasons, but if you are convinced the latest WIndows update caused this you can also try reverting your Windows update to an earlier version, to double-check., using the View Windows Update History setting, within your Windows Updates menu.