Exposure control errors when recording videos with...

I noticed that when I record videos, the exposure sometimes is not adjusted properly. If lighting conditions change, exposure remains at the same level, and records became over or underexposed. This is especially noticeable outdoors.
I have a few minutes long sample recording where the recording starts normally, then as light conditions change, (I slowly move from a shady area to a lit area) exposure gradually degrades to a point where most of the recording "burns out" due to extreme overexposure ( about 80% of the picture is white).
What confuses me is when I tried to reproduce this problem (albeit it different lighting conditions), exposure control worked pretty good.
I wonder if these exposure problems are due to a bug, hardware problem or a device limitation.
Do you have any tips to get better recordings with the phone?
Nokia Lumia 520 3046.0000.1329.2001 RM-914
Nokia Asha 302 V15.09 22-05-13 RM-813

The phone runs the latest firmware (3.36) available currently. There are no image-related changes mentioned in the 3.36 changelog though.
Nokia Lumia 520 3046.0000.1329.2001 RM-914
Nokia Asha 302 V15.09 22-05-13 RM-813

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Exposure control errors when recording videos with...

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