Change in Video Extension Specifications

Regarding the ability to generate a video from an image, the extension was previously 10 seconds, but now it is 7 seconds. This is still fine, but the object in the extended video no longer moves at all at the same prompt as before. The color effects and palette of the video itself have also suddenly changed, and I think the overall quality has dropped. I think it may have changed between Nov. 14 and 15, but I would like it to be restored to its previous state. It makes my subscription meaningless.