How to Fix UniFi Protect Camera Flapping Offline and Online
- Insufficient/marginal PoE power
- Bad or too-long Ethernet cable
- PoE switch power budget exceeded
Problem Description
A UniFi Protect camera repeatedly goes offline and comes back online every few minutes — Protect shows the camera flapping between connected and disconnected states. A damaged Ethernet cable, insufficient PoE power budget, IP address conflict, switch port errors, or a firmware bug causes the camera to cycle between online and offline.
Why This Happens in Real Homes
A UniFi Protect camera flapping between offline and online is almost always a power or cabling problem — marginal PoE that browns out under load, a bad or too-long Ethernet run, or a PoE switch exceeding its power budget all cause the camera to drop and reconnect repeatedly. It's rarely the camera's own fault.
Check the PoE: confirm the switch has enough power budget for all connected devices and that the camera's port delivers adequate wattage (PoE+ where needed). Replace a suspect or over-length Ethernet cable (runs over ~100m fail), and try a different PoE port. Re-seat connections firmly, stabilize the network, update firmware, and ensure the camera isn't overheating. Solid power and clean cabling stop the flapping.
Symptoms
- Camera flaps offline/online
- Repeatedly disconnects and reconnects
- Intermittent connection
- Camera bounces online/offline
- Frequent drops
- Unstable connection
- Flapping status
- Reconnect loop
Recognize these? Here's what usually causes it.
Common Causes
- Insufficient/marginal PoE power
- Bad or too-long Ethernet cable
- PoE switch power budget exceeded
- Faulty PoE port
- Network instability
- Firmware issue
- Overheating
- Loose cable connection
Most fixes happen in the first 3 steps.
Do not assume software bugs before ruling out PoE/cabling issues.
Tools & Requirements
Step-by-Step Solution
Check the Ethernet cable and PoE connection
A camera that flaps between online and offline every few minutes almost always has a physical connection issue. Check: the Ethernet cable for damage, kinks, or water intrusion (outdoor cameras). Test with a different Cat5e/Cat6 cable. Check the cable crimps at both ends — a loose connector causes intermittent contact. At the switch: verify the port link light is stable (not flickering). If using a PoE injector instead of a PoE switch: check the injector's output and try plugging the camera directly into a PoE switch port to rule out the injector.
Verify PoE power is stable and sufficient
If the PoE switch's power budget is exceeded: it drops and re-enables ports cyclically, causing cameras to flap. In the UniFi Network app: check the switch's PoE budget (Devices > select switch > PoE tab). If total PoE consumption is near the budget limit: the switch drops lower-priority ports when demand spikes. Solutions: reduce PoE load by moving cameras to a second PoE switch, upgrade to a switch with higher PoE budget, or use a dedicated PoE injector for high-power cameras. The USW-Pro-24-PoE provides 400W — enough for ~30 standard cameras.
Check for IP address conflicts
If two devices have the same IP: both flap as they fight for the address. In the UniFi Network app: go to Clients > search for the camera's IP. If two entries appear with the same IP: there is a conflict. Fix: give the camera a fixed IP or DHCP reservation. Remove the conflicting device or change its IP. After resolving: restart the camera to pick up a clean connection. IP conflicts are common when mixing static IP assignments with DHCP on the same subnet range.
Check the switch port for errors
In the UniFi Network app: go to Devices > select the switch > Ports > click the camera's port. Check for CRC errors, packet drops, and link speed changes. High error counts indicate a bad cable, bad port, or incompatible negotiated speed. If errors are high: try a different switch port. If errors follow the cable: replace the cable. If errors follow the port: the switch port may be failing. Also check that the port is set to Auto negotiation — forcing a specific speed can cause instability with some camera models.
Update camera and switch firmware
Firmware bugs can cause PoE negotiation issues that make cameras flap. Update the camera firmware: in Protect > Devices > select camera > Update if available. Update the switch firmware: UniFi Network > Devices > select switch > Update. Recent UniFi firmware updates have fixed PoE negotiation bugs with specific camera models (G5 Pro on USW switches had known PoE restart issues). After updating: monitor the camera for 24 hours to confirm the flapping stops.
Quick Solutions
Still having issues? This is usually the deeper cause below.
This usually happens right after a router reboot or ISP change — the device rejoins the network but drops its cloud session silently.
Track flap intervals to correlate with switch events.
Most WiFi drop-offs happen right after a router reboot or ISP swap — the device reconnects to the network but silently loses its cloud registration.
- Insufficient/marginal PoE power
- Bad or too-long Ethernet cable
- PoE switch power budget exceeded
- Faulty PoE port
- Network instability
Before you go — try one of these (they fix most cases).
Official Manufacturer Manual
UniFi Protect provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your UniFi Camera Stability.
Source: help.ui.com
Need More Help? UniFi Protect Support
Note: The contact information below connects you directly to UniFi Protect's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
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