Diagnosis
The weak WiFi signal or a router compatibility issue is causing the drop. This model's WiFi module has limited range and doesn't handle network band-switching well.
How to Fix It
Move the dehumidifier or your router so they are within 15 feet of each other with minimal obstructions. In your router settings, set up a separate 2.4GHz network (it doesn't connect to 5GHz) and connect the unit to that.
If That Didn't Work
Perform a hard reset on the dehumidifier's WiFi: hold the WiFi button on the unit for 10 seconds until it beeps, delete the device from the SmartLife app, and re-add it from scratch.
Heads Up
If your router merges 2.4GHz and 5GHz into one SSID, it will confuse this device. Splitting them is non-negotiable for a stable connection.