when I had a debate with Apple users, I shows them Samsung's accessibility settings. it proves Samsung build galaxy for disabled persons too.. it's make me proud as a Samsung user! salute to your developers
please check mobile data or WiFi speed.. Facebook Twitter and Instagram fully depends internet speed except WhatsApp. WhatsApp you can scroll to previous history as much you can because of the Data stored in your own device.
it's may be new updation i don't aware about it. two months back i was experienced it. accidentally removed esim and the QR code was not usable again. as per Etisalat call center i should apply for new one. or though their application.