If your dash cam refuses to turn on, keeps restarting, or disconnects unexpectedly, it can be incredibly frustrating—especially when you rely on it for daily protection.
Many drivers experience problems like:
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The dash cam won’t power on after installation
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The device keeps restarting in a continuous loop
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It works briefly but then shuts down or reboots
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Rear or side cameras randomly disconnect
While these symptoms may look different, they almost always point to the same underlying cause:
👉 Unstable or insufficient power supply.
Below is a professional breakdown of why these issues occur and how to resolve them effectively.
1. Why do these problems occur?
Root Cause: Unstable or Insufficient Power Supply
The Freexar D4 is a four-channel dash camera, which means it needs to power:
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Front camera
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Rear camera
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Left and right side cameras
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4K video processing
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IR night-vision components
Because of this, the D4 requires:
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Stable 5V / 2A output
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Continuous and uninterrupted voltage
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Minimal voltage fluctuation under load
When the power source cannot meet these requirements, you may experience:
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Failure to boot
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Endless restart cycles
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Sudden shutdowns during driving
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Rear or side camera dropouts
In short: 90% of restart issues are caused by insufficient power, not a defective device.
2.Common Symptoms Explained Professionally
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Device does not power on
Common causes:
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Using the car’s built-in USB port(Insufficient current)
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Using unqualified third-party USB chargers
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Loose or unstable power connections
Most vehicle USB ports only output 0.5A–1A, while the D4 requires a stable 5V/2A.
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Dash cam keeps restarting
A textbook sign of unstable voltage.
Typical scenarios include:
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USB interface current limiting
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Voltage drop in third-party chargers
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Overheating charger causing unstable output
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Aging or high-resistance cables
The system automatically protect and restarts when detecting power fluctuations.
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The dash cam works for a while, then restarts
This happens when:
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Startup voltage is just barely sufficient
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Temperature rises or load increases → voltage drops
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Auto-protection triggers → restart
Most common during summer or long drives.
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Rear or side cameras disconnect intermittently
This indicates insufficient current.
When power is limited, the system prioritizes the main unit, causing:
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Rear/side cameras to drop first
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Intermittent black screens
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Unstable multi-channel recording
All of these are typical signs of insufficient power supply.
3.Always Use the Original Freexar Charger and Cable(most critical)
Included in the Freexar package:
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Original 5V/2A cigarette-lighter charger
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Original high-quality power cable
These ensure:
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Stable output even under four-channel load
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No voltage drop
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No random shutdowns or restarts
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Reliable long-term performance
Do NOT use:
× Vehicle USB ports
× Third-party USB chargers
× Cheap/low-quality cables
× Old or damaged wires
All of these cause restarts, black screens, and camera dropouts.
4.If Your Vehicle Has No Cigarette Lighter Port — Use an ACC Hardwire Kit
Some cars—especially EVs—come only with USB ports. In this case, you must use an ACC hardwire kit.
Benefits include:
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Stable power directly from the fuse box
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No USB current limitation
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Supports parking mode
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Excellent long-term reliability
👉 To learn more about ACC hardwiring, click here: （https://www.amazon.com/dp/B0FYN1813J）
Conclusion
Almost all restart or shutdown issues are caused by unstable or insufficient power, not a faulty device. Follow these recommendations:
✔ Use the original Freexar charger
✔ Use the original power cable
✔ Use an ACC hardwire kit if no cigarette port is available
✔ Avoid powering the dash cam from USB ports
With stable power, 99% of issues disappear instantly.