iPad Mini 3 screen randomly dims and then gets brighter WHILE actively using it.
So a couple days ago (Wednesday night to be exact), I was scrolling through Facebook on my iPad Mini 3 when I noticed my screen suddenly dimmed (although only slightly). It stayed slightly dim for about 5-15 seconds and then brightened back up to where it was previously before it has slightly dimmed. About 2 minutes passed and the screen randomly dimmed (again slightly) for about 5-15 seconds and then brightened back up. It did this a few more times over the course of the next 10 minutes and then it stopped. I would also like to note that it did the same exact thing a couple days before that on Monday afternoon. I turned the auto brightness feature off to see if that would do the trick but it happened again with the auto brightness feature off. It hasn't done it since Wednesday night.
Is it a bug with iOS 8.1.3, or is there something wrong with the iPad itself, or is a possible feature that I don't know about? I'm debating on whether I should to take it back to Best Buy and do a return and exchange and get a new one.
iPad Mini 3 -OTHER, iOS 8.1.3