Storm Incoming - SHIELDS DOWN!

This has now happened twice to me. I have a base in the deep desert. I have the generators fueled to maximum, 20d 20h. I have not built any machines, penta shields, prudence doors, or wind traps in the base, so there is literally only 15 power being drained to power the base shield/sub-fief. My sub-fief and generators verify only 15 power being used with a ton to spare.

Then, along comes a sand storm and suddenly I get a warning that shields are down. I run to my sub-fief. Plenty of fuel, circuits are stable. I look at my generators. They appear to be operating. All of that aside, the storm almost completely destroys my base.

It's one thing when it happens while I'm there. I can repair, grab anything important in storage, hide in my still tent. But it has also happened while I was away, which could have been catastrophic as I had not moved all of my spice and titanium back to Hagga yet.

Anyone have any insight on this?