I'm pretty sure this is an issue with Principia. If you remove it, the moon stops teleporting around and blowing up any ship that gets too close to the surface.
For a while, I would drop Principia in for getting my craft from Earth orbit to a Lunar orbit, then remove the mod and restart to land, then add it again when I'm done. These days, I've been running enough Lunar missions that I haven't bothered re-enabling it. Unfortunately, it actually needs to be removed (it's not enough to disable it from the in-game Principia UI), and with the long startup times, it's tedious to switch.