Please help,
02:39:12:015 8effd700 ETH: GPU0 0.000 Mh/s, GPU1 0.000 Mh/s, GPU2 0.000 Mh/s, GPU3 0.000 Mh/s, GPU4 0.000 Mh/s
02:39:12:411 cb707700 em hbt: 1, fm hbt: 65,
02:39:12:411 cb707700 watchdog - thread 0 (gpu0), hb time 1592
02:39:12:411 cb707700 watchdog - thread 1 (gpu0), hb time 1714
02:39:12:411 cb707700 watchdog - thread 2 (gpu1), hb time 1791
02:39:12:411 cb707700 watchdog - thread 3 (gpu1), hb time 1670
02:39:12:411 cb707700 watchdog - thread 4 (gpu2), hb time 1787
02:39:12:411 cb707700 watchdog - thread 5 (gpu2), hb time 1665
02:39:12:411 cb707700 watchdog - thread 6 (gpu3), hb time 1555
02:39:12:411 cb707700 watchdog - thread 7 (gpu3), hb time 1676
02:39:12:411 cb707700 watchdog - thread 8 (gpu4), hb time 1595
02:39:12:411 cb707700 watchdog - thread 9 (gpu4), hb time 1716
02:39:12:411 cb707700 WATCHDOG: GPU error, you need to restart miner :(
What is it and why does it restart the miner?