EHX Freeze getting warm?

Hey all! So I've been using the Freeze for the last few months and I absolutely love the thing! Last night during practice, I was fiddling with the knob and noticed the Freeze was very warm. Now this is my first EHX pedal (I mainly use Boss and Aguilar, and have never experienced this).

I don't use the EHX adapter, but power it with the Voodoo Labs PP2 (in slot 5, which VL said works for EHX pedals.