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Completely disabling sleep mode

I am using the ble_app_uart example as my base on a 52832 with sdk 12. My project runs off line power and needs to remain available for connection 24/7. I have commented out BLE_ADV_EVT_IDLE case in on_adv_evt() function and the BSP_EVENT_SLEEP case in bsp_event_handler() function.

LED 1 blinks indicating that it is advertising, and for a few minutes it is visible in nRF Connect. But, after approximately 5 minutes the device is no longer visible. However, the LED continues to blink as though the device is still advertising.

Is there something else required to disable sleep mode completely?