Really long freezes, while it could be something else, are often caused by the RAM being full, this is called thrashing.
Big memory hogs like the browser or discord could trigger thrashing behaviour if you’re already low on RAM. Since this happened after an update, the most likely cause is a bug in any one of the many processes that are running on your computer. That kind of bug is called a memory leak, where a process is requesting memory for something, but then fails to give it back when no longer needed.
You should monitor memory usage to see if it is that, and to find out what process it is.
Ok that’s weird. My first guess would be something kernel-related, so maybe try booting the old kernel if you still have it, or just try a different kernel.