Microcontroller current draw goes up when its Vdd rail goes to ~3V..why?

Hello,

We are using the Atmel SAM3N00B micro.
We set the supply monitor to 3V.
Why is it that when the micro's supply rail gets near 3V its current draw goes up by 3mA (from 1mA to 4mA)?

SAM3N00B MICROCONTROLLER DATASHEET:
https://www.electro-tech-online.com/custompdfs/2013/05/doc11011-1.pdf

According to Sec 5.3
Note:

Restrictions
With Main Supply < 3V, ADC and DAC are not usable.
With Main Supply >= 3V, all peripherals are usable.

Click to expand...

I'm guessing the extra current is due to the peripherals being activated?

maybe thats right, maybe when at the threshold voltage the perioherals are getting activiated then deactivated repeatedly, and this draws more current?