Since I updated to Oreo 2 weeks ago, my phone has many issues. it keeps freezing and says "system ui has stopped working or " samsung personal experience has stopped working". I have to reboot my fone at least 3x daily. please help. ps apart from har...

I bought my fone in Ghana aand found that it was from Dubai. how do I get the benefits of Samsung Pay in Ghana? all I see are the Dubai ones