I am having a very random issue with Premier, I have a large timeline and on it there is a selection of music tracks form the same folder all mp3 and m4a which have just stopped working. They used to play fine and have used them for years with out a problem. I can see the waveforms but no sound is coming out. I have moved the original folder and files around and re-linked them and temporally they work again but the problem then comes back. It also is slowing down the software and becomes unresponsive. Any one had this before or know a fix?