Noticed in my flight yesterday that when i took off, the gimbal was way off centre and the horizon was about 15-30 degrees out.   I tried a C1 recentre gimbal but that didnt correct it so i landed and did a Gimbal recaliibration and then took off again.

I noticed during the flight that the Gimbal again went 'wonky' in that the horizon would go off centre again.   

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Any idea what could be causing this at all ?

I have no suggestions as this is not normal behaviour.  Have you raised a support ticker with DJI.

Does not look as expected. I would contact support indeed.

Air2S is going back to DJI tomorrow as the wonky gimbal issue has remained and its getting more frequent.