Been running into a banding issue and excessive noise on mine in recent times. Seems to happen at ISO 1600 intermittently with one shot coming out just fine as it did when I first got my body and the next getting bands in the image in different locations each time and and a few times throughout the whole image. It only seems to happen every now and then but it's been getting more common and progressively worse.
Might be time to see if this Mack warranty is actually worth anything
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100% crop from one image at ISO 1600 without any exposure pushing in post. The lines are faintly visible and run all the way horizontally across the lower half of the original image.











Can see a pic taken with this Tamron on page 343 of this thread, the red "drag bike".
