Both KC115 cameras have very bad lag when viewing live feed. Most often the lag is more than simply a few minutes, it is hours. Closing and reopening the app will eventually help and may take up to hours. I have a Wi-Fi 6 router and very fast internet(state of the art equipment and service) and newer iPhone.  One thing that does help is constant interaction with the app once the cameras finally respond. But, don't we all have better things to do with our time than dedicate all our time to this app? So far these cameras get a performance rating of zero.