New Nokia 5.3 Laggy

[Nokia 5.3] i've bought my Nokia 5.3 two weeks ago. Since three days my phone feels laggy. Transitions and opening apps are kinda slow and it generally doenst feel smooth. Restarting fixes the problem for a while until it comes back. Does anyone else have this prorblem? Should i go back to the store or wait for a software update? Thanks for the help.