This usually happens when the device is exposed to liquids. It is very likely some capacitor on the device is broken and have caused internal electric leak. In this case, your device can still work, but it will drain the batteries significantly, probably only last for a few days. A normal WS1 device on default settings with brand new batteries should last for 4-6 months. You can use external 5V micro-usb as power source so you won't have to change the batteries any more.
For outdoor and high humidity environment, we suggest to use external DS18B20 temperature probe or water-resistant case. You can find more about the accessories on https://www.ubibot.com/accessories/
Both WS1 and WS1 PRO are not waterproof, so please keep them away from high humidity (over 85%) environment. We do have some accessories to protect them in tougher environments, more can be found at: https://www.ubibot.com/accessories/
Please note the device's optimal operational conditions:
Temperature: -20ºC to 60ºC (-4ºF to 140ºF)
Relative Humidity: 10% to 90%
Placing the device outside the above recommended temperature and humidity range can damage the device and significantly affect its accuracy and battery life.