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Quick answer

Random reboots are the firmware's watchdog protecting the miner after something went wrong — usually heat, a power dip, or a failing board. Find the trigger.

A watchdog reboot is a symptom; the trigger is almost always heat, power, or a marginal board.

Full diagnostic flow

Does it reboot more under load or when ambient is warm?
  • Worse when hot/under load → Thermal trips followed by watchdog reboots. Fix cooling/paste first — see the overheating tree. [Fix it yourself] Error-code guide →
  • Random, no heat pattern → Check the power side: PSU headroom, input voltage, and circuit/PDU load. Any sag or shared overload?
Check the power side: PSU headroom, input voltage, and circuit/PDU load. Any sag or shared overload?
  • Marginal PSU / sagging input → A brownout under load resets the controller. Use a PSU with headroom and a dedicated, correctly-rated circuit. [DIY with care] Error-code guide →
  • Power is solid → Re-flash with a clean, correct firmware image. Still rebooting?
Re-flash with a clean, correct firmware image. Still rebooting?
  • Stops after clean firmware → It was a corrupt firmware/state. Keep a known-good image; if it returns, the controller storage may be failing. [DIY with care] Error-code guide →
  • Still reboots on clean firmware → A failing hashboard or control board trips protection on every cycle. Bench-diagnose which board drops first. [Advanced DIY] Error-code guide →

This points at board-level damage. You can attempt it, but the realistic call for most owners is to send it to a repair bench.

Fix it yourself

Work the matching symptom decision tree and error-code guide step by step. Most cable, cooling, network and firmware faults are solvable on the bench you already own.

Send it to D-Central

Cracked solder, dead domains, shorted chips and EEPROM faults need a real repair bench. See transparent repair pricing or get a free repair quote — we diagnose and repair 38+ ASIC models in Laval, board-level, since 2016.

More tools: Kernel-Log Decoder · ASIC Fault Finder (650 codes) · All symptom trees

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Last reviewed June 12, 2026.