You can temporarily use your cell phone as a hotspot instead of the WiFi network. If the Solarbank E1600 connection is stable, the problem was caused by the WiFi connection. In this situation, you can try to resolve the problem by completing the following steps:

1. Check that the router is communicating with Solarbank E1600 at 2.4 GHz, because Solarbank E1600 does not support WiFi communications at 5 GHz.

2. Relocate the device to a position that is within 10 meters of the router. Also, ensure that few obstacles and walls (if possible) exist between them to ensure that there is a strong WiFi signal. Alternatively, add more repeaters to enhance the signal.

3. Check whether the number of devices connected to the WiFi network has reached the upper limit. If it has, disconnect some devices.

4. Check whether the "IOT Status LED" is flashing green. When it flashes green, the connection is being reestablished. In this situation, you can use your cell phone to establish a Bluetooth connection with Solarbank E1600, and then reconfigure the WiFi connection.

5. Upgrade both the app and firmware to their latest versions.