Hello everyone, I hope this post finds you all well! I wanted to share my recent experience with my Shelly devices, as I believe it might be helpful for others facing similar issues.
Over the past year and a half, I’ve been using seven Shelly 2.5 devices, and they’ve been a great addition to my smart home setup. However, recently, three of them started showing as ‘OFFLINE’ in the Shelly app. This was quite frustrating, especially since rebooting them would temporarily fix the issue for an hour or two, but they’d inevitably go offline again.
I tried several troubleshooting steps, including disabling eco mode and checking for firmware updates, but nothing seemed to work. I also noticed that the offline devices made a hissing noise, which the working ones didn’t. After some research and reaching out to the community, here’s what I discovered and how I managed to resolve the issue:
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Check for Interference: I realized that my devices might be experiencing interference from other wireless devices. Moving them away from potential sources of interference like routers or other smart devices helped stabilize their connection.
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Firmware Updates: While I initially thought my devices were up-to-date, double-checking revealed that two of them had pending updates. Installing the latest firmware seems to have improved their reliability.
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Power Cycle: For the device that couldn’t be manually controlled, I performed a hard reset by removing the battery for about 30 seconds. This brought it back online, and it hasn’t had issues since.
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Contact Support: After exhausting all troubleshooting steps, reaching out to Shelly support was the final step. They were helpful and provided additional insights, including a possible hardware issue if the problem persists.
I’d like to emphasize the importance of checking for firmware updates and ensuring that your devices are free from wireless interference. These steps might seem basic, but they often solve the majority of connectivity issues.
If anyone else is facing similar problems, I’d be happy to help troubleshoot or share more details about my experience. Let’s keep the community strong and supportive! 
Best regards,
[Your Name]