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Voltage stays on when power is removed

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Hello all,

 

     I designed a prototype circuit for my MSP430 and other components.  It is powered by two voltage regulators and a current source.  What confuses me is that after I remove the battery power (4.2V) from the circuit, it does not turn all the way off.  V+ drops to 500mV and then drops so slowly that it seems permanent.  After 5 minutes, it's still 350mV.  Is this normal behavior?

 

     I am a newly graduated bioengineer trying to do the job of an EE, so I'm sorry if this is a totally stupid question.  I have no idea what is happening!  I have an experimenter's board from TI (that I copied very closely for my circuit, especially the decoupling capacitors), and it does not do this.  I am tempted to just add a huge resistor between V+ and V-, but I figured that that would be a bad plan.

 

     Any help is much appreciated!


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