I had the exact same problem with cpuminer. I tried disabling fifo and using inactive restart setting to no avail... I'm currently using jmordica cgminer. It runs fine for 24-48 hours before crashing or a blade goes inactive. I restart every day or so. dbartl has a cgminer for pods/blades based on 4.3.5... but the compile instructions for windows seem out of date... packages for mingw, that you are instructed to download, don't exist. Maybe someone would be willing to compile it and post it here.