Try using Asic.to firmware and undervolt or overvolt it a bit. That seemed to be a fix in most instances. Also, if that does not work, try lower frequency with higher voltage.
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[2020/04/21 04:11:03] ERROR: src/temp.c:218 chain[0] sen[2] - Lost, no updates for 10 sec
[2020/04/21 04:11:03] ERROR: src/temp.c:218 chain[0] sen[3] - Lost, no updates for 10 sec
[2020/04/21 04:11:03] WARN: chain[0] - 2 sensor(s) reported their temps!
[2020/04/21 04:11:04] ERROR: src/temp.c:218 chain[0] sen[0] - Lost, no updates for 10 sec
[2020/04/21 04:11:04] ERROR: src/temp.c:218 chain[0] sen[1] - Lost, no updates for 10 sec
[2020/04/21 04:11:04] WARN: chain[0] - 0 sensor(s) reported their temps!
[2020/04/21 04:11:04] ERROR: driver-btm-chain.c:950 chain[0] - Failed to read temp from all sensors!
[2020/04/21 04:11:04] INFO: chain[0] - Shutting down the chain
[2020/04/24 11:07:43] INFO: chain[2] - 44 chips detected
[2020/04/24 11:07:44] INFO: chain[1] - 44 chips detected
[2020/04/24 11:07:46] INFO: chain[0] - 44 chips detected
[2020/04/24 11:07:53] INFO: Start-up temperature is 24 C (min -15 C)
[2020/04/24 11:07:53] INFO: Switching to manual fan control (100 %)
[2020/04/24 11:07:53] INFO: Setting voltage from 19500 to 19300 mV gradually
[2020/04/24 11:08:11] INFO: Setting freq from 50 to 750 Mhz gradually
[2020/04/24 11:08:11] INFO: Warming up the chips
[2020/04/24 11:08:21] WARN: Target temp 85 C is too high
[2020/04/24 11:08:21] WARN: Overriding target temp to 77 C
[2020/04/24 11:08:21] INFO: Switching to automatic fan control (77 C)
[2020/04/24 11:08:21] INFO: Start mining!
[2020/04/24 11:08:35] ERROR: src/temp.c:218 chain[0] sen[2] - Lost, no updates for 10 sec
[2020/04/24 11:08:35] ERROR: src/temp.c:218 chain[0] sen[3] - Lost, no updates for 10 sec
[2020/04/24 11:08:35] WARN: chain[0] - 2 sensor(s) reported their temps!
[2020/04/25 02:50:15] INFO: chain[2] - Initializing
[2020/04/25 02:50:15] INFO: chain[1] - Initializing
[2020/04/25 02:50:15] INFO: chain[0] - Initializing
[2020/04/25 02:50:28] INFO: chain[2] - 44 chips detected
[2020/04/25 02:50:32] WARN: chain[1] - 40 of 44 chips detected
[2020/04/25 02:50:35] WARN: chain[0] - 14 of 44 chips detected
[2020/04/25 02:50:43] WARN: chain[1] - 40 of 44 chips detected
[2020/04/25 02:50:46] WARN: chain[0] - 14 of 44 chips detected
[2020/04/25 02:50:55] WARN: chain[1] - 40 of 44 chips detected
[2020/04/25 02:50:55] ERROR: driver-btm-chain.c:487 chain[1] - Failed to detect ASIC chips
[2020/04/25 02:50:55] INFO: chain[1] - Shutting down the chain
[2020/04/25 02:50:55] ERROR: driver-btm-base.c:358 chain[1] - Initialization failed
[2020/04/25 02:50:58] WARN: chain[0] - 14 of 44 chips detected
[2020/04/25 02:50:58] ERROR: driver-btm-chain.c:487 chain[0] - Failed to detect ASIC chips
[2020/04/25 02:50:58] INFO: chain[0] - Shutting down the chain
[2020/04/25 11:31:15] INFO: chain[2] - Initializing
[2020/04/25 11:31:15] INFO: chain[1] - Initializing
[2020/04/25 11:31:15] INFO: chain[0] - Initializing
[2020/04/25 11:31:28] INFO: chain[2] - 44 chips detected
[2020/04/25 11:31:29] INFO: chain[1] - 44 chips detected
[2020/04/25 11:31:30] INFO: chain[0] - 44 chips detected
2020-02-02 15:38:53 power_api.c:91:get_average_voltage: error: total_chain get 0 !!
2020-02-02 15:38:53 power_api.c:109:check_voltage: target_vol = 17.90, actural_vol = 0.00, more than 0.5v diff.
2020-02-02 15:38:54 driver-btm-api.c:141:stop_mining: stop mining: power set failed!
2020-02-02 15:38:54 thread.c:832:cancel_check_miner_status_thread: cancel thread
2020-02-02 15:38:54 thread.c:806:cancel_temperature_monitor_thread: cancel thread
2020-02-02 15:38:54 thread.c:816:cancel_read_nonce_reg_thread: cancel thread
2020-02-02 15:38:54 driver-btm-api.c:127:killall_hashboard: ****power off hashboard****