My videos won’t load unless I plug in headphone or wireless headphone

iPhone X, it has been working fine only until this morning when I woke up, I thought it’s just my network problem so I discarded it. Only to get alarmed when I started receiving calls and it wasn’t ringing. Tried playing videos on YouTube it won’t play until I put on headphones. Voicenotes on WhatsApp won’t play unless I have headphones on.