It's battery is weak, else everything is OK. It has a problem that it hangs, crashes and then restarts and works fine after that. I don't think so that it is battery issue. Someone told me that your phone is opened. What the problem could be?

My S21 camera is not turning on it shows camera failed but when I try to turn it on in whatsapp. It turns on.I have tried every solution possible available on Internet and youtube but didn't work!