After receiving a new FC board under warranty from the supplier we were hopeful that the random flight problems for our Eachine QX95 would be fixed and we could finally get into some controlled flight. Unfortunately the FC board has not cured the problem. Whether it's a problem inherent in this particular board or something else we do not know at this stage.
Link to part 1 - https://www.youtube.com/watch?v=T4oUWpdJnRE