1. When u wake screen just unlock sound comes but screens remains off and appears after minutes. Hangs phone.
2.  Lags a lot. All apps.
3. No improvement in ram consumption. Should work on these
4. Battery heating issue since 8.1.4  update. Remains in 8.2 also. Fix this ASAP.
5. Play store not working as all say
6. Brightness has reduced a lot with auto mode
7. No feel and speed of nogut
8. Music player new looks is pathetic
There are good things also which u can see in changelog so I m not mentioning it

At least remove the lagging issue with new update asap plz.