Then it needs to be unplugged, it is probably the cause of your issues. Unregulated they can (and will) get hot enough to kill a BP.
You must have a thermostat.
Here are 2 good ones, don't bother with the junk sold in pet stores.
http://www.amazon.com/gp/aw/d/B000NZZG3S
http://spyderrobotics.com/
Do you at least have a probed thermometer?
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