Hi,
When this starts happening with my Android phone, it usually means that the screen got dirty from the oils from your skin, which blocks the sensor that tells if your face is next to the phone during a call.
You should clean the screen off with a soft cloth: 100% cotton, or else some kind of microfiber (cell phone stores sell things specifically for this purpose, but I usually use a clean t-shirt) and then it should work just fine again.
The other thing you can do is press the power/lock/wake button to make the screen wake up again.
Let us know if you have other questions!
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