请问这是什么原因

2020-03-08 10:38:53:driver-btm-api.c:123:killall_hashboard: ****power off hashboard****
2020-03-08 10:38:54:frequency.c:105:get_ideal_hash_rate_GH: ideal_hash_rate = 65963
2020-03-08 10:38:54:frequency.c:126:get_sale_hash_rate_GH: sale_hash_rate = 64000
2020-03-08 10:38:56:driver-btm-api.c:1367:dhash_chip_send_job: Version num 8
2020-03-08 10:38:56:driver-btm-api.c:1511:dhash_chip_send_job: stime.tv_sec 1583663936, block_ntime 1583663925
2020-03-08 10:52:22:driver-btm-api.c:1367:dhash_chip_send_job: Version num 1
2020-03-08 10:52:28:driver-btm-api.c:1367:dhash_chip_send_job: Version num 8