We are getting a consistant OA error message within our flights - becoming very annoying.  Not overly sunny, not overly windy.  Have done a calibration, didn't seem to help.  Nothing in the way; all clear.  GS Pro software.  Any ideas?

UAS,

I have only experienced this when operating into a sunrise/sunset or in hazy conditions.  If you are experiencing it in ideal conditions, I think you may have a faulty unit.  

Sorry I can't offer any better insight.

Cheers,

I got the same issue in My mavic Pro , solution : Use Dji  assistant to calibrate sensors

My own experience tells me that you have to calibrate these sensors periodically

The OP said that he has already completed a calibration.

If so, might be worth trying again a few times.  And if it still occurs, hopefully it is under warranty.

It's commonly reported with the drone flying toward a bright low sun.
It would be an unusual mapping mission that need obstacle avoidance anyway.
Just disable obstacle avoidance (and the drone will also be able to fly faster too).

If he is using GS Pro over the P4 RTK app, they might be more complex mapping missions (vertical).  I require all our pilots to have obs. avoidance on when mapping vertical faces, as some people cannot be trusted to not plan the flight into a wall.

But if it is a top down mapping mission, Labroides is bang on, disabling obs. avoidance wouldn't be an issue.

Precision and obstacle avoidance may fail