My Nokia 6 is foggy and do not know why?
Suggestion 1: Wipe cache partition by accessing your phone's Recovery Mode: https://forum.xda-developers.com/nokia-6/help/nokia-6-ota-update-ddls-t3721424/post75669145#post75669145
Suggestion 2: Factory data reset: https://www.nokia.com/en_int/phones/support/nokia-6-user-guide/reset-your-phone
Suggestion 3: Contact your local Nokia Care Center for repair: https://www.nokia.com/en_int/phones/support/care-center-locator
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