I think this relates to some kind of hardware problem. Some time ago I purchased a laptop from Vaio company. After two days the camera of the laptop was not in working condition and gave an error. Then I went to retailer shop and claim the warranty and they replaced the laptop. So, I think if the problem is still there in your tab then you should check your tab to a good technician and If your tab is in the Warranty then claim the warrant without wasting any time.