my nest e keeps losing wifi connection every day or two, i have to reboot it to reconnect

Diagnosis

The Nest Thermostat E frequently drops Wi-Fi connections due to a combination of limited onboard memory and a sensitive 2.4GHz radio. When the thermostat's internal cache becomes saturated or it encounters a momentary dip in signal strength, the network chip can enter a "hang" state. Unlike a computer, the Nest E often fails to automatically initiate a handshake request to the router once the connection is severed, requiring a hard reboot to clear the temporary memory and force a new DHCP request. This issue is compounded by "signal noise" or interference from other 2.4GHz devices (like microwaves or baby monitors) and physical obstructions. Because the Nest E is often mounted on interior walls containing metal studs or electrical wiring, the signal can be attenuated just enough to cause instability. You can confirm this by checking the "Network" section under Technical Info; if you see a high "100%" packet loss or a signal strength indicator that fluctuates between "Fair" and "Poor," the hardware is struggling to maintain a stable link with your access point.

How to Fix It

To resolve the intermittent connectivity and stop the need for daily reboots, follow these precise steps to optimize the connection and clear the device cache:

1. Perform a Power Cycle: Pull the Nest E display off the base. Wait exactly 30 seconds to allow the capacitors to discharge completely. Snap it back onto the base. This clears the temporary system cache and resets the Wi-Fi radio.
2. Verify Signal Metrics: Navigate to Settings > Technical Info > Network. Check the signal strength. If the value is listed as "Fair" or "Poor," you must move your router closer or install a Wi-Fi extender within 15 feet of the thermostat.
3. Assign a Static IP: Log into your router's admin panel (usually 192.168.1.1 or 192.168.0.1). Find the Nest E in the connected devices list and assign it a "Static IP" or "DHCP Reservation." This prevents the connection from dropping when the router attempts to renew the lease.
4. Force 2.4GHz Band: If you have a dual-band router with a single SSID (Smart Connect), the Nest E may be attempting to jump between 2.4GHz and 5GHz. Create a separate Guest Network specifically for 2.4GHz and connect the Nest E to that dedicated band.
5. Update Firmware: Go to Settings > Software. If an update is available, trigger it immediately. Several legacy firmware versions for the Nest E had known bugs regarding the WPA2 handshake process.

If That Didn't Work

• Check the C-Wire (Common Wire): Many Nest E installations rely on "power stealing" from the Rh/Rc wires. If your system lacks a C-wire, the thermostat may not be getting enough voltage to keep the Wi-Fi chip powered during high-demand periods, causing it to crash. Install a Nest Power Connector or a dedicated 24V C-wire to ensure constant power.
• Change the Wi-Fi Channel: Use a Wi-Fi analyzer app to see if your neighborhood is crowded on Channel 6 or 11. Manually switch your router's 2.4GHz channel to 1, 6, or 11 (non-overlapping) to reduce interference that causes the Nest E to drop the signal.
• Disable "Airtime Fairness": If you have a high-end ASUS or TP-Link router, disable the "Airtime Fairness" setting in the advanced wireless menu. This feature often kicks slower legacy devices (like the Nest E) off the network to prioritize faster devices.
• Factory Reset Network Settings: Go to Settings > Reset > Network. This wipes all saved Wi-Fi profiles. After the reset, reconnect the device from scratch to clear any corrupted network configuration files.

Heads Up

• Voltage Warning: If you decide to install a C-wire, always turn off your HVAC breaker first. Touching the Rh and C wires together can blow the 3-amp fuse on your furnace control board.
• Router Placement: Avoid placing your router inside a metal cabinet or directly behind a television, as this creates a "dead zone" that specifically affects the Nest E's low-power radio.
• Battery Drain: Frequent Wi-Fi searching consumes significant battery. If your thermostat shows a "Low Battery" warning alongside connection drops, it is almost certainly a power delivery issue (missing C-wire) rather than a router issue.