Accelerometer?
Gyros?
Compass?
Where were your calibrations performed (where were you standing)?
What were your mod values (at rest) on deck after doing the calibrations?
There have been two versions of firmware released since you purchased your Inspire. Have you updated each time and are you running the most recent? (v1.8.1.00).
Are you a pilot who calibrates their compass either before each flight or each time you move location?
Did the aircraft exhibit TBE at any point during GPS flight?
Sorry - lots of questions......
I don't know what the mod values were, who checks these when they are out on a job. Yes I calibrate every time at the home point with no large metal obstructions. firmware is always the latest, No TBE was experienced. I am a professional why can't you accept a fault took place, one day someone will be seriously injured if this problem is not sorted. I will not fly the inspire on any commercial job from now on. My insurance only covers me for £2 million!!!!!
Ahhhhhh.....OK.
To answer your questions.
I personally check mod values before every single take off as do most members on this forum.
Compass calibration SHOULD NOT be done before every flight and there lies your problem I believe.
I too am a professional and use two Inspires commercially. I have held PFAW for a number of years and never had a SINGLE problem with either machine since they were first introduced.
But then I am not a compass calibration junkie. So many times a problem starts with..
"So I calibrated the compass before the flight and....."
I fear you suffered a bad calibration back in January and again in May.
Had you have taken note of your mod values (this is written into my ops manual and forms part of my pre-flight) you would not have suffered this incident.
Additionally, checking mod values would have alerted you to a bad accelerometer value or a gyro not giving 1.0 at rest.
So to answer your question "who checks those when they are out on a job?" - well pretty much everyone who does a comprensive pre flight checklist and wants a trouble free flight.
With regards to your comment "why can't you accept a fault took place" and someone could be injured unless this is sorted.
You may well have suffered a fault (that's what we are trying to ascertain) or, as I suspect, you introduced a bad compass calibration and were not aware of it because you do not check your mod values.
If there were a 'problem' that 'needs sorting' I think with over 17,000 members on a dedicated Inspire Forum we would be hearing more about random uncontrollable flights off to the side that might kill someone.
Although you have joined the community today, you have made your second post saying why can't I just accept a fault occured when I was simply asking questions to attempt to get to the bottom of what happened.
I think it would be wise to look over this forum and do some in depth reading (there is a wealth of information on here and some very experienced multirotor pilots who contribute) and you may not know the Inspire as well as you think you do.