How to Fix UniFi Protect Camera Showing High Packet Loss

Problem Description

A UniFi Protect camera shows high packet loss in the device statistics — the video stream has artifacts, freezes, or drops frames. A damaged Ethernet cable, switch port errors, unstable PoE power, network uplink congestion, or a firmware bug between the switch and camera can all cause packet loss.

Why This Happens in Real Homes

High packet loss on a UniFi Protect camera is a physical-network problem in the large majority of cases — a bad or over-length Ethernet cable, a faulty switch port, or EMI along the cable run corrupts packets, showing up as loss and a choppy stream. Marginal PoE and a saturated uplink are the other suspects.

Start with the cable and port: replace a suspect or too-long Ethernet run (keep under ~100m), try a different switch port, and route the cable away from power lines and other EMI sources. Confirm PoE is stable and adequate, and check for a duplex/speed mismatch. If the uplink between the switch and controller is oversubscribed by many cameras, reduce bitrate or add capacity. Clean cabling and a healthy port clear the loss.

Symptoms

• High packet loss on a camera
• Packet loss warnings
• Choppy/dropped stream from packet loss
• Loss in the diagnostics
• Intermittent video from packet loss
• High loss percentage
• Stream degraded
• Loss spikes

Recognize these? Here's what usually causes it.

Common Causes

• Bad or too-long Ethernet cable
• Marginal PoE causing instability
• Network congestion / oversubscribed link
• Faulty switch port
• Interference/EMI on the cable run
• Duplex/negotiation mismatch
• Overloaded controller/uplink
• Firmware issue

Tools & Requirements

Step-by-Step Solution

1

Check the Ethernet cable for damage

High packet loss on a wired camera is almost always a physical cable issue. Inspect the cable run from the camera to the switch: look for damage, tight bends (minimum bend radius for Cat5e/Cat6 is 1 inch), cable ties cinched too tight (deforms the cable and causes crosstalk), and water intrusion at outdoor connections. Replace the cable if any damage is found. Use Cat6 for new runs — it has better shielding and lower crosstalk than Cat5e. Maximum cable length is 100 meters (328 feet) — beyond this, packet loss increases dramatically.

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2

Check the switch port for errors

In the UniFi Network app: go to Devices > select the switch > Ports > click the camera's port. Check: CRC errors (bad cable or interference), input/output errors, port speed (should be 100 Mbps or 1 Gbps — if negotiated at 10 Mbps: bad cable), and duplex (should be full-duplex). If errors are high on this port but not others: the cable or camera NIC is faulty. Try a different switch port with a known-good cable. If errors follow the camera: the camera's Ethernet port may be damaged.

3

Verify PoE is stable on the camera port

Unstable PoE power causes the camera's network interface to reset intermittently, which registers as packet loss. In the UniFi Network app: check the camera port's PoE status for power fluctuations. If the PoE wattage delivered fluctuates or the port shows PoE restarts: the switch may be hitting its PoE budget and cycling ports. Move the camera to a dedicated PoE injector (rated for 802.3af/at) to provide stable, independent power. The USW-Pro switches have per-port PoE priority — set the camera port to 'High' priority.

4

Check for network congestion on shared links

If multiple cameras share an uplink that is near capacity: all cameras experience packet loss during peak streaming. In the UniFi Network app: check the uplink port utilization for the switch the camera is on. If the 1 Gbps uplink is consistently above 800 Mbps: add a second uplink (LAG) or upgrade to 10 Gbps. Each 4K camera can use 15-20 Mbps — 50+ cameras on a single 1 Gbps uplink will cause congestion.

5

Update switch and camera firmware

PoE negotiation and Ethernet driver bugs can cause packet loss on specific switch/camera combinations. Update both: in UniFi Network > Devices > select switch > Update. In Protect > Devices > select camera > Update. Known issues: USW-Lite switches had PoE packet loss bugs with G4 cameras on firmware 6.2.x — resolved in 6.5+. Always update both devices in a pair when troubleshooting packet loss between them.

Quick Solutions

Still having issues? This is usually the deeper cause below.

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.