YES--Calibrating the IMU will certainly help and may even fix the issue completely but sometime in the future maybe you will notice your gimble doing this again.If Cafguy is correct about " inconsistencies between the IMU and The gimbal sensors" then might a calibration of the IMU help?
Secondly, I am pretty sure there is a 'manual' adjustment feature for gimbal roll of ±10 deg or so available in the app but you'd have to look for it.
Thirdly, is your drone sitting level? Looking at your photo and the drone's shell, its RHS look low, as if the RH arm were sitting high.
If I am correct then it maybe that the pin at top of one of the front arm pivots is bent. It's not a major job to replace a damaged one but positioning the arm at the 'tipping point' between spring-open and spring-shut is likely to make removing and replacing the pivot MUCH easier.
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