I have just experience some issue on my S21 ulta. It was fully charged ( up to the safe 80%) on Wednesday, worked fine on tge way to work and then decided to shut itself down while in my pocket. Tried to switch it back on, nothing. I had to use the multiple buttons press to get it back alive for a bit. Then it shut off again and again I had to use different buttons to get it back on. It got stocked on the "Galaxy logo" screen fee times. As I started to search on the net what could help, I accessed the menu to clear the cachée but it kept going off. Once back home, I plugged it in to charge it but it did not recognised that the charger was plugged in. Only plugging it into my PC with a normal USB 3.0 to the USB c got it to charge slowly and be alive while plugged in. I came onto the Members app to run diagnostic, everything ticked ok except the charging. Yesterday I plugged it on one of my colleague S25 charger and it did recognise it. We went into maintenance mode and ran the maintenance process. Since, it stays on, it recognises my original charger but if I try restarting it, it does not restart and I still have to use 2 buttons for it to switch back on. I have also spend iver an hour on the phone with the tech support that could not do much except proposing a hard reset. I went to see a repair shop this morning that told me it was a software issue and that they had few customers with it on S21 and S22. How is it that after an official software update from company itself causes issues rather than sorting them? How come we have to deal with it as customers without any help, notification, support from Samsung? Is there anyone here on the chat that would like to give some explanations?