I am wondering if i should try what jbillke did by warming up the chips during booting process.
I don't think the frequency and voltage adjustments will help if the chains aren't initialized. I haven't had much luck with that. Looks like in the log that the pre-heat, voltage tuning, and frequency tuning is done after the board detects all the chips are good to go.
Perhaps this is why i've had luck manually pre-heating the boards, as it gets them up to temperature before it attempts to detect all the asic chips. Try to get the startup temp to 75 C and see what happens.
[2020/04/25 19:41:01] ERROR: driver-btm-chain.c:487 chain[0] - Failed to detect ASIC chips
[2020/04/25 19:41:01] INFO: chain[0] - Shutting down the chain
[2020/04/25 19:41:02] ERROR: driver-btm-base.c:358 chain[0] - Initialization failed
[2020/04/25 19:41:05] INFO: Start-up temperature is 28 C (min -15 C)
[2020/04/25 19:41:05] INFO: Switching to manual fan control (100 %)
[2020/04/25 19:41:05] INFO: Setting voltage from 21000 to 19400 mV gradually
[2020/04/25 19:41:33] INFO: Setting freq from 50 to 700 Mhz gradually
[2020/04/25 19:41:33] INFO: Warming up the chips
[2020/04/25 19:41:41] INFO: Switching to automatic fan control (75 C)
[2020/04/25 19:41:41] INFO: Start mining!
[2020/04/25 19:42:41] INFO: Setting voltage from 19400 to 19200 mV gradually
[2020/04/25 19:43:03] INFO: Setting voltage from 19200 to 19000 mV gradually
[2020/04/25 19:43:26] INFO: Setting voltage from 19000 to 18800 mV gradually