Ok, if you got it from a pet store and it is knob operated, that is NOT a thermostat. That is a rheostat and they are worthless unless the room the snake is in is kept at a Constant temperature 24/7. Those things fluctuate with the surrounding temps.
If you don't have the money to get a good t-stat (Johnson for $80 is cheapest) then you can get by with the ZooMed ReptiTemp 500R thermostat. $20 or so at ReptileSupply.com. It's an actual t-stat that does the job until you can afford the better stats.
Otherwise, get yourself a Johnson, Ranco, or Herpstat. Those are $80, $80, and $100+ respectively.
Once you have an actual thermostat that keeps temps constant, you shouldn't have as much trouble if any.
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