Well, I'd do a factory reset. Any retailer or Samsung will tell you that. I don't know if that will solve your problem, but unfortunately it is a necessay step.... I'm not sure it you can use Samsung Switch for backing up your phone (using only one phone?); You obviously want to get backed up.
Google will not back up your text messages and calls. I assume there's a way to backup your pone to a tablet or computer.... Good luck.