In order to help you we'll need to know more...
What type and size enclosure is the snake in?
How are you heating the enclosure?
How are you measuring temps?
Are your heat sources regulated by a THERMOSTAT???
Are there at least 2 proper hides?
How much does the snake weigh?
How long have you had the snake?
What type/size prey are you feeding? How often?
Are you handling the snake?
The more you tell us the better we can help you...