Problem with JTAGICE/mkII at 3V

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I'm having a problem using the JTAGICE/mkII with an ATmega168-20 with Vcc at less than 3.3V. Above 3.3V averything works fine, below 3.3V nothing but problems. Looks like the Flash doesn't program correctly and breakpoints are unreliable. Other times Avr Studio reports errors such as "target disconnected"

If i progrma the board at 3.5V it programs fine, and runs fine at the low voltage.

The supply voltage for this part is 2.7-5.5V, nothing in the data sheet reguarding the minimum voltage for programming either Flash or Eeprom.

Anyone have any ideas as to what the problem would be? Pointers to an app note or data sheet page that would shed some light on this?