Screen ALWAYS goes black when on call. How do I keep on?

My Samsung Galaxy Alpha (Lollipop 5.0.2) screen always goes black during a call. I often have conference calls with the speaker on, I rarely actually hold the phone up to my ear. When the call starts, the screen almost immediately goes dark and I have to tap it every couple of seconds to keep it on. I like to use my phone frequently when on calls and like to see the time, notification bar etc. without having to tap every couple seconds. I wouldn't care about this if I weren't on work calls for 6 hours out of every day.

I've tried apps with no luck (the best was 'Screen On' but it doesn't work for this purpose). My phone isn't rooted but debating looking into rooting if it can fix this error.

My settings do not give the option to 'turn off proximity sensor' so I am stuck with this issue. Short of just buying a new phone, does anyone have any ideas on how to fix this?

Thanks!

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