Welcome to the community
I'm sorry to hear that American Sniper didn't play back with good picture quality. I'll be happy to help check this out for you.
Has this happened before on anything else you have order through Catch Up or On Demand?
I have checked this out in the office here and it plays out ok with no picture issues.
I would like to check this further for you, I wasn't able to locate your account. I will send you a private message requesting further details. (Look for the envelope icon above)
Tech fan? Have you read our Digital life blog yet? Check it out