Why Your 70mai Dash Cam Keeps Restarting: Fixes for Power and Firmware Issues

Quick answer

A 70mai dash cam that keeps restarting is almost always losing stable power, not failing internally. Test the cigarette-lighter cable and charger first, then check the hardwire kit fuse and ground, and finally update firmware. If the camera restarts on a known-good 12V source with a different cable, the camera itself is the problem and you should stop swapping accessories.

Restart loops are frustrating because the camera looks fine for a few seconds, then reboots before it finishes recording. On most 70mai dash cams, that loop points to power delivery, not a dead camera. The camera draws a brief surge at startup, and if voltage sags below its threshold, it restarts, then tries again.

Work through the checks below in order: power source, cable, hardwire kit, firmware, then storage. Each step either fixes the restart or narrows the cause. Stop as soon as the camera holds a recording for several minutes without rebooting, and only replace hardware when a known-good power source still fails.

Start with the simplest power source

Before touching firmware or settings, confirm the camera gets stable 12V. Plug it into a different vehicle, or use a known-good USB charger rated for the camera's current draw. If the restart disappears, the original socket or charger is the cause. Many 12V sockets lose contact over time, and a loose plug causes exactly this reboot pattern.

Inspect the cable for kinks, pinches at the door seal, or a bent connector. A cable that works intermittently will pass a quick bench test but fail once the car moves. If you have a second compatible cable, swap it in. This single swap resolves a large share of dash cam power issues without buying anything.

• Test in a second vehicle before assuming the camera is faulty.
• Wiggle the plug while recording; a restart confirms a loose connection.
• Avoid USB ports shared with phones or chargers that throttle current.

Check the hardwire kit and parking mode

If the camera restarts mainly when parked, the hardwire kit is the prime suspect. A poor ground, a blown fuse, or a connection to a circuit that drops voltage when the car sleeps will cut power and trigger a reboot. Recheck the ground to bare metal and confirm the fuse tap sits in a circuit that stays live in parking mode.

Voltage cut-off settings matter too. If the cut-off is set too high, the kit disconnects early and the camera appears to restart or shut down. If it is too low, the camera may run until the battery sags, then reboot. Adjust the cut-off to a moderate setting and retest overnight.

• Confirm the ground is on bare metal, not paint or plastic.
• Verify fuse orientation and rating in the hardwire kit.
• Retest parking mode for one full night after any change.

Update firmware and rule out storage

A dash cam firmware update can fix restart behavior caused by bugs in recording or parking logic. Update only with the camera on stable external power, never on battery alone, and follow the official file and method for your model. An interrupted update can leave the camera worse off, so a steady power source is non-negotiable.

Storage is the next common cause. A failing or full memory card can stall recording and trigger a reboot. Format the card in the camera, not on a computer, and test with a known-good card. If restarts stop with a different card, replace the card rather than the camera.

• Update firmware with the camera connected to stable power.
• Format the memory card inside the camera menu.
• Swap in a second card to confirm a storage-related restart.

When to stop troubleshooting and change course

If the camera restarts on a known-good 12V source, with a different cable, after a firmware update, and with a fresh card, the fault is inside the camera. At that point, further accessory swaps waste time. Contact 70mai dash cam support with your model, firmware version, and the steps you already tried.

If the camera is older and out of warranty, compare repair against replacement. A camera that also shows image faults, won't hold settings, or reboots within seconds of power-on is usually not worth repairing. Choose a replacement that matches your parking and channel needs instead of repeating the same setup.

• Document each test result before contacting support.
• Stop buying accessories once a known-good source still fails.
• Replace rather than repair if multiple unrelated faults appear.

Restart diagnosis map

• Restarts only while driving: Power delivery is intermittent. Check the 12V plug, cable routing, and charger current rating. Swap the cable before anything else. If a second cable fixes it, replace the cable and stop.
• Restarts only in parking mode: The hardwire kit or vehicle battery is the likely cause. Verify ground, fuse tap, and voltage cut-off, then consider a battery pack. If the car battery is old, a battery pack is the safer fix.
• Restarts at random, any time: Suspect firmware or the memory card. Update firmware on stable power, then format or replace the card. If both fail on a known-good power source, the camera is faulty.
• Won't turn on at all: Confirm power at the connector with a multimeter. No voltage means a cable, fuse, or socket problem; correct voltage means the camera needs support. Contact 70mai dash cam support with your test results.

Parts that solve restart and power problems

• 70mai Battery Pack for Dash Cam: Extended Parking Surveillance Duration: Seamlessly utilizes stored energy, ensuring uninterrupted surveillance while safeguarding your vehicle's battery life during parking. Two Charging Setups: Cigarette lighter power for simplicity & hardwire connection for faster charging. If your restarts happen only in parking mode because the car battery sags, a dedicated battery pack keeps the camera powered without draining the vehicle battery.
• 70mai Rear Camera RC11 for Dash Cam A510/ A810/ A800S/ A500S/ A400/ A200/ S500: Please note that our dash cams only support two channels, so if you want to connect a rear camera, then you cannot connect the interior camera at the same time, and vice versa. Adding channels changes the power draw. If you recently added a rear camera and restarts began, confirm your power source can support the two-channel setup.
• 70mai External GPS Module for Dash Cam Lite 2: Includes a 2-meter cable for flexible mounting. A loose or damaged accessory cable can introduce intermittent faults. If restarts started after installing the GPS module, reseat its cable and retest.

Most restart loops come down to power, not the camera. Test the source and cable, inspect the hardwire kit, update firmware on stable power, and rule out the memory card. If the camera still reboots on a known-good 12V supply, stop troubleshooting and contact 70mai support or replace the unit.