I've never had any problems with my Samsung Galaxy S6 phone. However, today, it started freezing up and powering on and off. Safe mode did not help. I finally did a factory reset which took a while because the phone was freezing during this process. I finally got the factory reset to work and after a few hours, the same problems returned. I'm using the phone in safe mode now. Any ideas about what could be the problem, especially after a factory reset? Thanks in advance.