@denali1973, I experienced something similar a few months ago. Below is a link to my situation at the time.
Out of curiosity, are you using the original power supply provided by RS? Are you extending the length of the power cable at all to get the RS out to a specific location? If so, your problem might be related to the RS not getting enough power ( ~ 5V) to function properly. The power supply only provides 5V which can degrade if the power cable is too long. If you are extending your power cable, I think the link might be of help for you to get some ideas.
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