My Samsung M31 display flickering without any physical damage or droppingNeed tips for troubleshooting

Wifi in my home connected to my mobile. Till yesterday everything is normal. From today wifi is not connecting only to my mobile. It works normally on all my family members mobiles.

I am using 8gb variant of M31I have selected 8gb of internal memory to be used as RAM and restarted my deviceBut still even after restarting, it is showing total RAM is 8gb insted of 16gb

I am using Galaxy M31When we are saving contact name with . followed by name Its automatically displaying a space after .For example if we save a number as K.SureshAfter saving the contact it will show as K. SureshCantact names are not displaying lik...