Missing Spice

As the title says, almost all my spice is missing. How is this possible?? I'm not sure exactly how much I had, but it was certainly in the hundreds at least. It was all the spice I've gathered since beginning the game.
Today I made my first spice refinery and somehow I had only 88 spice available.
My buddy has permissions to my base, but he's super reliable super ethical; I've known him for 45 years. So, that's not it.
All my stuff is on one circuit, so that's not it.

Two possibilities:
my power went off at some point and someone raided my base, but took only spice -- Actually, no, they can't do that unless the sub-fief generator is destroyed, right?

Okay, so here's another possibility: for the past couple of days, a worm has been attacking my base. Every time I try to build in one particular area, a worm appears and then erupts from the sand underneath my base and destroys that particular work I was doing.
Is it possible that the worm somehow consumed sand from my base even though it's located i inventory far far away from where the attack occurred???