Lumia 640 LTE strange camera behavior

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Ever since yesterday, my 640 has been acting strange in regards to switching between capturing photos / capturing videos. Before, it would switch seamlessly between video and camera, with no difference other than the change of on screen UI. Now, whenever I switch to taking video, the exposure is much lower, yet if I switch back to taking photos, the exposure is normal.


I've tried it in both Lumia Camera and Microsoft Camera, and it's happening in both. It happened in neither before. 

I've tried soft resetting the phone, uninstalling the Lumia Camera app, soft resetting and then reinstalling the app to no avail. 


What causes this behavior and is there any way to fix it? 


L.E: All settings are default, exposure / white balance / ISO, etc - set to automatic. 

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