Thought I would share a trick I learned from my helicopter mechanic friends. Use your wife's nail polish to paint a torque stripe across the dropout bolts. If the lines move- time to retorque.
Such a nice simple solution! I'm going to do that to my drop-outs straight away (although not with purple, it wont match the rest of my bike)
I don't crash, I just have slightly uncontrolled dismounts!