Why Does My Shelly Relay Keep Dropping WiFi or Going Offline
- Metal junction box blocking WiFi signal
- Router too far from Shelly location
- 2.4GHz channel congestion
Problem Description
Your Shelly relay keeps disconnecting from WiFi and showing offline in the app. The physical switch still works but you lose remote control and automations. Shelly relays installed inside electrical boxes have weak WiFi because the metal junction box acts as a Faraday cage blocking WiFi signal.
Why This Happens in Real Homes
Your Shelly relay keeps disconnecting from WiFi and showing offline in the app. The physical switch still works but you lose remote control and automations. Shelly relays installed inside electrical boxes have weak WiFi because the metal junction box acts as a.. In real usage this appears as Shelly shows offline in app, Physical switch works but no remote control, and WiFi drops every few days
The pattern in this case points to Metal junction box blocking WiFi signal, Router too far from Shelly location, and 2.4GHz channel congestion. The repair usually holds when done in order: Check WiFi Signal, then Fix Router Channel, then Set Static IP. After applying the fix, validate behavior with repeated command tests and at least one full automation cycle to confirm stability.
Symptoms
- Shelly shows offline in app
- Physical switch works but no remote control
- WiFi drops every few days
- Automations stop running
- Shelly reconnects after power cycle then drops again
- Signal strength shows very low in Shelly settings
Recognize these? Here's what usually causes it.
Common Causes
- Metal junction box blocking WiFi signal
- Router too far from Shelly location
- 2.4GHz channel congestion
- Static IP conflict with another device
- Shelly firmware needs update
- Power supply voltage fluctuation
Most fixes happen in the first 3 steps.
Shelly relays are installed inside electrical junction boxes connected to mains voltage. If you need to access the Shelly for antenna modification or wiring changes turn off the circuit breaker first. Mains voltage is lethal.
Tools & Requirements
Step-by-Step Solution
Measure WiFi quality at relay location
Check RSSI near the Shelly relay enclosure and account for electrical box shielding. Weak signal in-wall is a primary cause of repeated offline drops.
Set stable DHCP reservation
Reserve a fixed DHCP lease for the relay to reduce reconnect churn after router events. Address instability can present as random offline behavior.
Review router channel congestion
Move to a cleaner 2.4GHz channel and reduce overlapping interference from neighboring networks. Congestion causes packet loss and relay disconnects.
Update Shelly firmware and reconnect settings
Install latest firmware and verify reconnect retries and WiFi credentials are correct. Older firmware builds may recover poorly after brief outages.
Power-cycle relay after network stabilization
Restart the relay only after router and WAN are fully stable. Controlled reboot often clears stale network stack state.
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.
If the Shelly is in a metal box and WiFi is impossible consider using Shelly with MQTT over a local network instead of cloud. Local control is faster and more reliable than cloud when WiFi is marginal.
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.
- Metal junction box blocking WiFi signal
- Router too far from Shelly location
- 2.4GHz channel congestion
- Static IP conflict with another device
- Shelly firmware needs update
Before you go — try one of these (they fix most cases).
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Official Manufacturer Manual
If you need the complete manufacturer documentation for advanced setup, wiring diagrams, or detailed specifications, you can download the official manual below. The manual includes full technical instructions directly from the manufacturer and may help if your issue requires deeper troubleshooting.
Download the Official Shelly Smart Relay ManualSource: shelly.cloud
Need More Help? Shelly Support
Note: The contact information below connects you directly to Shelly's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
