What Happens When the Wifi Goes Down?
A CrowdStrike Update Crashed 8.5 Million Machines. Was Your House One of Them?
In July 2024, a faulty CrowdStrike update crashed 8.5 million Windows machines worldwide, grounding flights, freezing hospital systems, and taking down Microsoft 365 services for hours. In February 2024, AT&T's network went dark for 12 hours, leaving millions without cellular service. Microsoft Teams and Outlook have had multiple outages in the past year alone.
These aren't hypotheticals. They're Tuesday.
If your smart home is built on the assumption that the internet will always be there, you're one outage away from locked doors, dead thermostats, and security cameras that can't record. The good news: with the right design, most of your home can keep running even when everything else falls apart.
What Actually Breaks
Not all smart home systems fail equally. The damage depends entirely on how your system was designed.
Cloud dependent devices stop working entirely. Many consumer smart home products route everything through remote servers. Your voice command goes to Amazon, gets processed, and sends a command back to your device. No internet? No lights. Some smart locks, thermostats, and cameras become completely unresponsive without a connection.
Remote access disappears. Even if your system works locally, you lose the ability to check cameras, adjust the thermostat, or unlock the door for a guest from your phone when you're away.
Some automations break. Anything that relies on cloud services, weather data, or external triggers stops running. Your sunset lighting scene might not fire if it depends on a cloud calculation of when sunset actually is.
If you work from home, the pain compounds. Your corporate VPN might route through Azure. Your video calls run on Teams. Your files live in OneDrive. When Microsoft goes down, your workday stops even if your home internet is working perfectly. Microsoft 365 has had major outages in January 2025, September 2024, and the CrowdStrike incident in July 2024.
The pattern is clear: centralization creates fragility.
What Should Still Work
A properly designed system maintains core functionality even when disconnected.
Local processing is the key. Systems like Savant process commands locally. Press a button, the light turns on. No cloud round trip required. Your lighting scenes, climate schedules, and basic automations continue running because the brain is in your house, not in a data center in Virginia.
Hardwired systems are more resilient. Devices connected via ethernet or dedicated control wiring don't care about your Wi-Fi status. Wired keypads, wired sensors, and wired connections to your AV equipment keep working regardless.
Local recording keeps your cameras useful. Cameras that record to a local NVR in your home keep capturing footage even without internet. Cloud only cameras like Ring or Nest stop recording entirely during outages. If security footage matters to you, it needs to live on site.
Your Options When Connectivity Fails
The most common scenario is a simple ISP outage. Your provider has a problem, or someone hits a fiber line with a backhoe, or there's a regional issue.
Cellular failover is the simplest fix. A router like a UniFi gateway with LTE or 5G backup automatically switches to cellular when your primary connection drops. Your home stays online at reduced speeds. Hardware runs $200 to $500 plus $20 to $50 a month for a data plan.
Starlink as backup provides true infrastructure independence. This is increasingly viable for homes in Fairfield and New Haven Counties. Starlink's satellite internet provides a completely independent path that doesn't share infrastructure with your cable or fiber provider. If Optimum goes down, Starlink keeps working. If there's a regional fiber cut, Starlink doesn't care. A cell tower outage, a major regional disaster that takes out ground based infrastructure...Starlink routes around it via satellite. The dish runs around $500 plus $120 a month for residential service.
Dual ISP is an option if your area has both cable and fiber from different providers. Run two connections with automatic failover. If Optimum goes down, your Frontier connection takes over.
For clients who absolutely cannot afford downtime, executives working from home, medical professionals on call, anyone running a business from their residence, the belt and suspenders approach is primary fiber with Starlink backup and cellular as a third tier. It sounds like overkill until the first time it saves your workday.
Building Resilience Into Your Home
Choose systems with local processing. Savant and similar professional platforms process commands locally. Many consumer devices don't. Ask the question before you buy.
Put your network equipment on a UPS. A small uninterruptible power supply for your router, switch, and primary access point keeps you online during brief power outages. 30 minutes of battery backup costs under $150 and covers most flickers and short outages.
Add a backup internet path. Whether it's cellular failover, Starlink, or a second ISP, having an independent path to the internet means your primary provider's problems don't become your problems.
Record cameras locally. An NVR with a few terabytes of storage gives you weeks of footage that no outage can touch.
Wire what you can. Wireless is convenient. Wired is reliable. Critical devices like security cameras, access points, and control system processors should be hardwired whenever possible.
Keep manual overrides for critical functions. Smart locks should have a key override. Motorized shades should have manual controls. A smart thermostat should allow local adjustment. If everything depends on working automation, you're vulnerable.
The Bottom Line
The internet will go down. Cellular networks will have outages. Microsoft will have another 365 outage. This isn't pessimism. It's planning.
A well designed smart home acknowledges these realities and builds in resilience. Local processing keeps your home running. Backup connectivity keeps you connected. Proper architecture means an outage is a minor inconvenience, not a crisis.
We think about these scenarios before we install a single device. What works when everything works is easy. We focus on what still works when things go wrong.