Why script random quitting? Here is log.. I use 5.4c version

2020.12.22:12:24:51.773: main *** 45:08 *** 12/22 12:24 **************************************
2020.12.22:12:24:51.773: main Eth: Mining ETH on eth-eu1.nanopool.org:9999 for 8:24
2020.12.22:12:24:51.773: main Eth: Accepted shares 3002 (5 stales), rejected shares 0 (0 stales)
2020.12.22:12:24:51.773: main Eth: Incorrect shares 0 (0.00%), est. stales percentage 0.17%
2020.12.22:12:24:51.773: main Eth: Maximum difficulty of found share: 141.3 TH (!!!)
2020.12.22:12:24:51.773: main Eth: Average speed (5 min): 182.323 MH/s
2020.12.22:12:24:51.773: main Eth: Effective speed: 184.74 MH/s; at pool: 184.74 MH/s
2020.12.22:12:24:51.773: main 
2020.12.22:12:24:52.225: unkn Quitting...
2020.12.22:12:24:52.444: hwmc GPU1: reset VRAM timings
2020.12.22:12:24:52.444: hwmc GPU2: reset VRAM timings
2020.12.22:12:24:52.444: hwmc GPU3: reset VRAM timings
2020.12.22:12:24:52.444: hwmc GPU4: reset VRAM timings
2020.12.22:12:24:55.763: wdog Stopping watchdog thread
2020.12.22:12:24:55.796: main Exit code: 0