Last night my rain sensor kept giving me notifications every hour. It will active and deactive in the same minute. I will do it twice an hour. All through the night. I got up and looked outside and it never rained all night. It was a cold night, but no rain fall at all. It was around. 5:51 am when I got my last notification. I know it's not a bad sensor cause it's new and has been working since I bought my system. Any ideas?