WS1 Problems Help

I have several ads-ws1 stations and in two of them I am having problems. One after being programmed and in operation, after a few days it stops giving data about the rain. Just turn on the computer to read and then write and work well for a few days. Days later come back to not give rain data. The second is different. It accepts to be read, it accepts the programming and it does not work. Sometimes the led is always red, sometimes it flashes red very quickly and sometimes it doesn't even light up any color. I have tried several versions of firmware even what is available online and the result is always the same. The board version is 1.6. What can I do? Best regards
Nuno António