Certain Keys on keyboard unresponsive - digitizer replaced (x2)

I have an iPhone 5s w/ unresponsive keys r/q/p when vertical. When I turn on it's side and the key's shift to the larger keyboard I can use those keys. It seems like a bad digitizer. I bought the replacement screen through iFixit and they sent another screen as after describing the issue this was the tech's thought as well. Now on the third screen/digitizer (original and 2 replacements) with the same issues. I've ensured that software is up to date. Any suggestions?