I use Samsung S10+, bought it March 2019 very good condition without damages. Recently after the last 2 system updates the system started to slow down alot, stop working a lot I have to restart it several times, I take long time to save contact numbers or even open it. I have free space more than 20GB in internal memory.
I am an S10+ user too, but I have never faced with the problems you've mentioned here. Depending on your RAM, these tips may help you. Try to avoid keeping a lot of apps open on the background. Restart your smartphone at least one time in a day (usually at night times). Or you can download NOVA launcher if it really bothers you.
