With the reliance on prone with the new patches you need to be able to crawl into and out of buildings more consistently. I've had a number of deaths so far because my character will go from prone to crouching after leaving a building and this instantly ramps the sound meter to 3. Consequently you agro any Z's within a large radius. Makes it very frustrating when you've successfully avoided a horde on the way in. The auto crouch also occurs on the way in but usually with not as drastic consequences. I like the changes with the new patches. Much more intense starting with hardly any gear and having zombies much more dangerous.