AcuRite on Amazon: https://www.amazon.com/AcuRite-00891...qid=1475789366

I've heard WalMart carries them as well, but I haven't looked for myself.

Could you post a pic of your setup and some more details about the equipment you're using? It's tough to diagnose just based on your little blurb at the end. Could be nothing - could be something.