Why Does My Shelly Smart Switch Keep Losing WiFi After a Power Outage

Problem Description

Your Shelly smart switch loses its WiFi connection every time the power goes out and does not reconnect automatically when power returns. The switch still toggles the light manually at the wall but disappears from the Shelly app and your smart home automations stop working. You have to manually reboot the Shelly or power cycle the breaker a second time to get it back online. This is a common issue caused by the Shelly booting faster than your router after a power outage, so it fails to find the WiFi network during its initial connection window.

Symptoms

• Switch works manually but disappears from app after power outage
• Shelly device shows offline in app after blackout
• Automations stop working after brief power flicker
• Must power cycle breaker twice to get Shelly back online
• Shelly LED shows AP mode after power restore
• Multiple Shelly devices all go offline simultaneously after outage

Recognize these? Here's what usually causes it.

Common Causes

• Shelly boots faster than router after outage so WiFi is not available yet
• Router takes 2-3 minutes to restore WiFi but Shelly gives up after 60 seconds
• Shelly firmware bug in older versions causing reconnection failure
• Static IP configuration conflicts after router reboot
• WiFi channel changed by router auto-optimization after restart
• DHCP lease expired during outage and router assigns different IP

Tools & Requirements

Step-by-Step Solution

1

Confirm Shelly reconnect settings and firmware

Check firmware version and Wi-Fi reconnection parameters after reboot events. Older firmware can fail to recover properly after brief outages.

2

Stabilize router boot and DHCP availability

Ensure router is fully online before Shelly devices attempt reconnect and DHCP pool has free leases. If DHCP is unavailable at boot, devices may remain offline.

3

Set static DHCP reservation

Assign reserved IP addresses for Shelly units to reduce post-outage lease churn and conflict. Stable addressing improves reconnect reliability.

4

Check signal strength at switch location

Measure Wi-Fi quality where the switch is installed and add mesh coverage if weak. Marginal signal often fails first during post-outage reconnect storms.

5

Power-cycle device after network is stable

Once router and internet are restored, restart Shelly switch to force clean rejoin. If repeated failures continue, reconfigure Wi-Fi credentials and test again.

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Quick Solutions

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

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.