My craft was beautufully stable on the V.17 fw, but since updating, I have noticed that the craft wants to do a very slow yaw in the direction of the last inputed user yaw command.  It is as if the stick has not centred and there is a very slight user input.  This has the effect of making my still photos slightly blurred.  I try correcting with the stick, but it just starts to drift again  Has anyone else noticed this issue and if so have you managed to solve it?  

Regards.

Jason

Yes, I solve it by giving it some reverse yaw to stop it.

imu calibration as well as compass calibration should be don be for every flight. I calibrate my imu on a stable level suffuse before flying that day and calibrate the compass every time i change batteries just to be safe

Did you trie a RC calibration?

I will try an TC and imu calibration.  Thanks for the suggestions