I am surprised to say it but I am up to 15 flights no crashes. Knocking on plenty of wood. I flew 15 flights between my two 450s yesterday and this morning and have been lucky so far. I think its more than 15 but thats the amount me and the guys can confirm.
I stopped counting my crashes after the 4th one...... or was it the 5th....... or mabey the 6th one! Anyway, i gave up counting them a long long time ago. They still happen and are mostly self inflicted!
If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!