Why is my phone not ringing?

I am getting no sound notification for my calls.
1.My speaker is fine- it plays music, it plays the ringtone when I go to settings where I apply ringtones to call slots, there is just no sound to incoming calls.
2. All I have noticed prior to this is that the phone sometimes rang too softly, or it rang loudly but became low or silent after the first ring.
3.My ringtone is turned up to the highest volume.
4.There's nothing wrong with my ringtone- I've used this same tone on 3 different phones and the whole room used to be able to hear it.
5.My phone model is a HTC Desire 820 G Dual Sim.

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