Wrong (or even wierd) exposure with Electronic Shutter on X-T2

[Dmitry_R]

I was shooting a timelapse with electronic shutter and have encountered the following strange underexposure of a frame

First image is with normal exposure, two others - with wrong one.

Sometimes ony part of a frame is underexposed, sometimes this part is even curved (last image)

 

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[RM_Photog]

I had noticed some weird under-exposing of certain frames in a series of photos with the electronic shutter but nothing as drastic as this! What was your shutterspeed at for these photos? 

[jlmphotos]

Could it be the shutter speed dropped below the minimum ES shutter speed?  

[tom3q]

The curved one is probably just showing lens correction. The only thing (besides a hardware or firmware issue) that comes to my mind is that, for some reason, aperture changed while the camera was reading pixels from the sensor, but that only would have an effect if your total shutter speed was very short (near the sensor readout time).