Weird Screen Flip Issue

[muzz3256]

So lately I've been having this weird issue, it seems that the phone has gotten the signals crossed for when I have the keyboard open and when I have it closed, so when the keyboard is closed, the screen is flipped horizontally, and if I open the phone, it flips vertically. This started randomly and doesn't happen, but it will do it randomly while I'm using the phone, or when the phone wakes up for a call, it will randomly flip, and then I cannot answer the call. I am using the stock ROM and have already performed a hard reset hoping that this would fix the problem, but it has not. The phone has had a few falls, but nothing severe. I have exhausted everything that I can think of before I take it back to Sprint. Any ideas?