Should I be having to factory reset my phone after having the phone for only 5 months?? For the past 2 months ( initially 3 months of having my phone) I've experienced a noticeable difference in speed of the device including texting speed, switching through screens and apps, and it had started to show instances of it freezing. I've gotten the whole run around from samsung and it is so frustrating! I've done the regular restart, clearing cashe/ cashe partition, deleted apps, I stop apps from running in the background and I am constantly clearing up my device on device care. I have taken it to a Samsung store to get diagnosed as well as to UbreakIfix, and there is no "real" problem, but when I use it, it's slow! Even the person at UbreakIfix noticed the slow speed in texting. I have seen the differences in my phone from when I first got it in April to now. I just feel like I shouldn't be having these issues so early on especially for a $1000 phone! They said in order to do an exchange is has to be sent in for repairs at least twice...but it's a pretty brand new phone. Is anyone else experiencing this???
Have you tested the phone in safe mode to see if it still responding slowly? https://www.samsung.com/us/support/answer/ANS00062983/
Do you restart your phone regular? If not, I would restart it once or twice a week. I have noticed a considerable difference in my Galaxy s9+ since starting that. There is a setting where you can schedule it to automatically restart. For instance, I have mine set to restart on Wednesdays and Saturdays at 6pm. This clears the phone's cache and overall gives it a fresh start. See if that helps. Otherwise, you might consider going through and deleting any apps that you don't recognize or don't use. It might be a sketchy app causing problems.
In almost all these cases where the phone slows down, it's an app or apps that cause the issue. Resetting fixes it and you think it's because the phone isn't good and requires reset but it fixes it because the apps are gone.