Just had my third major crash in two weeks.  This time took out 4 props and my receiver ....   I think that I at last understand the problem.   I have been really keen to use RTL and up to and including .37 it has been unusable for me.  The model would fly off at 45 degrees etc and the first two crashed were when I switched back to stable mode.   Today on .38 the RTL function was at last working…