Can you share a Image where this issue is present or at least the Settings you use; Like Camera Model (1.4 or 2.1), Firmware Version; Resolution, Shutter Setting; Gain Setting (analog and Digital) as well as Framerate and Possibly White Balance/ Color Matrix Settings?
Would help a lot in figuring this out, otherwise i can only share my best guess regards this.
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I assume its probably a High Gain setting causing this, as that was a common issue with Previous Firmware Versions when Overexposing and is still sometimes present in the Current Firmware Version if extreme Settings are used.
With this camera / Sensor used in the Camera, you usually want to avoid (at least extreme ) overexposure, or if you have to, use a really low gain Setting like 0dB Gain. If you need solid White Color Output Pixels as a result, it probably is beneficial for image Quality to not overexpose, but rather leave the Brightest spot still a little below clipping, then Boost Exposure in Post Production from DNG Footage, or using Color Curves or whatever Tool You Prefer to do that.
