Ram Preview Stops Working - FIX

With no warning the After Effects ram preview stops working. My old solution was to restart AE. Clearing memory and all those other things doesn't work. Here's what I found that works reliably every time: It turns out it's a problem is with audio sync. If you go into your preferences and open up audio hardware and change your latency- It doesn't matter what you change it to, I toggle between 100 and 120, but the whole point is to select a different latency. That forces the sync to reset and when you close the preference window your RAM preview is back up!