read kernel log

hi

this is my kernell log.this problem occure every 1 week. and show hashrate 0 and all temp--127--127--127.after restart the device work normally.can you help me why this error exist?

021-12-01 05:09:46 frequency.c:1231:inc_freq_with_fixed_step: chain = 0, freq_start = 670, freq_end = 670, freq_step = 5, is_higher_voltage = true
2021-12-01 05:09:46 frequency.c:1231:inc_freq_with_fixed_step: chain = 1, freq_start = 670, freq_end = 670, freq_step = 5, is_higher_voltage = true
2021-12-01 05:09:46 frequency.c:1231:inc_freq_with_fixed_step: chain = 2, freq_start = 670, freq_end = 670, freq_step = 5, is_higher_voltage = true
2021-12-01 05:09:46 frequency.c:1231:inc_freq_with_fixed_step: chain = 0, freq_start = 670, freq_end = 670, freq_step = 5, is_higher_voltage = true
2021-12-01 05:09:46 frequency.c:1231:inc_freq_with_fixed_step: chain = 1, freq_start = 670, freq_end = 670, freq_step = 5, is_higher_voltage = true
2021-12-01 05:09:46 frequency.c:1231:inc_freq_with_fixed_step: chain = 2, freq_start = 670, freq_end = 670, freq_step = 5, is_higher_voltage = true
2021-12-01 05:09:46 frequency.c:1058:inc_asic_diff_freq_by_steps: chain = 0, start = 670, freq_step = 5
2021-12-01 05:09:47 frequency.c:1058:inc_asic_diff_freq_by_steps: chain = 1, start = 670, freq_step = 5
2021-12-01 05:09:49 frequency.c:1058:inc_asic_diff_freq_by_steps: chain = 2, start = 670, freq_step = 5
2021-12-01 05:09:51 driver-btm-api.c:743:set_timeout: freq 690 final timeout=106
2021-12-01 05:09:51 power_api.c:268:set_higher_voltage_raw: higher_voltage_raw = 1800
2021-12-01 05:09:51 thread.c:1472:create_check_system_status_thread: create thread
2021-12-01 05:09:51 driver-btm-api.c:2758:bitmain_soc_init: Init done!
2021-12-01 05:09:51 driver-btm-api.c:222:set_miner_status: STATUS_INIT
2021-12-01 05:09:56 driver-btm-api.c:222:set_miner_status: STATUS_OKAY
2021-12-01 05:09:57 frequency.c:316:get_sale_hash_rate_GH: g_sale_hash_rate = 58000
2021-12-01 05:10:01 driver-btm-api.c:1539:dhash_chip_send_job: Version num 4.
2021-12-01 05:10:01 driver-btm-api.c:1686:dhash_chip_send_job: stime.tv_sec 1638335401, block_ntime 1638335381
2021-12-01 06:09:52 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 06:09:52 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 06:09:52 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49
2021-12-01 06:10:14 driver-btm-api.c:1539:dhash_chip_send_job: Version num 1.
2021-12-01 06:10:28 driver-btm-api.c:1539:dhash_chip_send_job: Version num 4.
2021-12-01 06:39:54 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 06:39:54 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 06:39:54 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49
2021-12-01 07:09:55 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 07:09:55 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 07:09:55 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49
2021-12-01 07:11:07 driver-btm-api.c:1539:dhash_chip_send_job: Version num 1.
2021-12-01 07:11:22 driver-btm-api.c:1539:dhash_chip_send_job: Version num 4.
2021-12-01 07:39:56 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 07:39:56 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 07:39:56 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49
2021-12-01 08:09:58 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 08:09:58 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 08:09:58 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49
2021-12-01 08:12:06 driver-btm-api.c:1539:dhash_chip_send_job: Version num 1.
2021-12-01 08:12:30 driver-btm-api.c:1539:dhash_chip_send_job: Version num 4.
2021-12-01 08:29:42 driver-btm-api.c:1539:dhash_chip_send_job: Version num 1.
2021-12-01 08:29:52 driver-btm-api.c:1539:dhash_chip_send_job: Version num 4.
2021-12-01 08:39:59 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 08:39:59 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 08:39:59 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49
2021-12-01 09:07:07 driver-btm-api.c:1539:dhash_chip_send_job: Version num 1.
2021-12-01 09:07:09 driver-btm-api.c:1539:dhash_chip_send_job: Version num 4.
2021-12-01 09:10:00 thread.c:255:calc_hashrate_avg: avg rate is 0.00 in 30 mins
2021-12-01 09:10:00 temperature.c:529:temp_statistics_show: pcb temp INVALID~-127 chip temp INVALID~-127
2021-12-01 09:10:00 thread.c:328:is_temp_reopen_core: current PCB min temperature(255) is too high, >= 49

best regards

ramizhasanov1980@gmail.com