Safety first: No electrical work is required.

Check signal strength: In the app or thermostat menu, view Wi‑Fi signal strength. If low, move the router closer or install a Wi‑Fi extender.
Change Wi‑Fi channel: Log into your router and select a less congested 2.4 GHz channel.
Disable router eco modes: Turn off any aggressive power‑saving or scheduled reboot features that may drop connections.
Re‑add device: Remove the thermostat from the app and add it again, following the pairing procedure.

Thermostat frequently disconnects from Wi‑Fi; app shows device offline intermittently.

Possible Causes