When warping between planets, my ground platform bugged out and the power connection to lower levels was lost. I suspect this was due to upgrading to Ground Platform 6 and the upgrade hitting while in space. When I ultimately landed on the target planet it fixed itself, but I imagine that'd be problematic if the transition period was longer, since my turrets couldnt load ammo without power.
Also, the pads on the ground for going up and down were gone, though walking into the correct spot still teleported me to the lower floors.