1.Restart the phone and make sure you have the latest version.
2.Back up all your data first, then reset all system settings and see if you fixed the issue.
Notice: Do not root the phone yourself. Rooting may cause phone system damage, and you will void the warranty of your phone.
If the issue persists, take your phone, proof of purchase, and warranty card to a nearby realme Service Center for professional assistance.
Source: Realme