Bugs on wp8.1 cyan

[Aashish13]

Have downloaded wp8.1 cyan on 720. Earlier had installed 8.1 via dev preview and I still face same old bugs like tiles going blank. Battery drainage too. Lag in notification centre when there are more than 2 notifications. I ahd even downgraded my os to wp8 via recovery tool b4 upgrading to cyan. Help!!!!!!!!