Did you cut the red wire on the usb cable that connects the pi with the first hub to prevent backpower?
My pi with 5 erupters runs fine for about a week on average before crashing. Maybe someone can help on how to find what's causing the crashing...
No I did not. The hub connected to the Pi is unpowered, should I still cut the red cable?
Would it be better to chain my powered hubs and then plugging them directly into the Pi?