"Although, I have never had the experience of the 44 door being sucked open while at speed"
Well, some of us have. It's not uncommon (particularly on early models for some reason) for a door to not latch correctly. It's a human error not to check before lift.
Sometimes just the middle latch engages in the frame, whilst the top misses.
This becomes apparent after lift, during transition or even on climb-out as the door gets sucked out by the low pressure area created at "speed".
Trying to pull against this and latching with one hand can prove impossible until the machine is virtually in a hover.