Do you restart your phone regular? If not, I would restart it once or twice a week. I have noticed a considerable difference in my Galaxy s9+ since starting that. There is a setting where you can schedule it to automatically restart. For instance, I have mine set to restart on Wednesdays and Saturdays at 6pm. This clears the phone's cache and overall gives it a fresh start. See if that helps. Otherwise, you might consider going through and deleting any apps that you don't recognize or don't use. It might be a sketchy app causing problems.
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