Suggest that you post your question to www.the12volt.com where there are many professional car installers and semi-professional car fans. They may be able to help you. My immediate reaction is that the timer module wtihin your starter box might drift with the ambient temperature. I have installed many remote starters on several vehicles by myself, and have never experienced any problem similar to yours. Maybe it is the time now to change your starter if it is too old. When posting your question on the12volt, you need to provide starter brand and model, and your vehicle make and model. Good luck buddy.