I just Bought Xperia XZ 2 monthes now (or Less), its lagging a lot
force closing apps alot

and the most significant thing is, when i receive a call, the phone keeps ringing for like 5 sec. until it wakes up and give the callers ID, sometimes it gives only number (saved contact) and after 1 sec it gives the caller ID…

I didn't find the right solution from the Internet.

-References
-https://talk.sonymobile.com/t5/Xperia-XZ/XZ-Lagging-a-lot/td-p/1227362

-Consumer Services Video