After adjusting many settings, by disabling stock calendar app. I was able to fix my issue. I went to the Google calendar as the stock calendar was stripped down since used on my S5.
When I would set up an event on Google calendar and set a reminder for 10 mins before and also an email reminder, a pop up would occur on my black screen and would fade away then keep reoccurring until I slid the X on the bottom to dismiss it. By stopping the stock calendar, issue solved.
When I would set up an event on Google calendar and set a reminder for 10 mins before and also an email reminder, a pop up would occur on my black screen and would fade away then keep reoccurring until I slid the X on the bottom to dismiss it. By stopping the stock calendar, issue solved.