Massive lag spikes and infinite loading near asteroids

[Neil Kermstrong]

Hello, I've found out a class E asteroid was gonna hit kerbin, so I got some KIS explosives (yes they are effective) and sent a vessel to rendezvous with it.

Success, my craft was just some meters away from the asteroid, so I left it, and planted some explosives on the asteroid (about 20 explosives) and then I exploded it, and for my surprise they actually worked and the asteroid was no more.

But I accidentally warped time and my astronaut went too far from the vessel, so I loaded a quick save. However, I've waited about 15 minutes and the game didn't load, I restarted it, loaded the save normally, and when I launched the craft from the tracking station the same thing happened.

I then decided to use a cheat to rendezvous another craft with the other one, but my game FPS fell to about 2 (where it runs at about 40FPS normally, some FPS drops when it's a big vessel but it was a small one) and after waiting 5 minutes my game just crashed.

This only happens when I am close to asteroids, everything else goes just fine.

How do I fix this? And is it possible to teleport that vessel away from the asteroid (preferably to kerbin's surface) without having to be in control of it?

[Neil Kermstrong]

Nevermind, I "fixed" it myself.

Got an earlier quick save from before I reached the asteroid (in saves/youragencyname/backup) and hard saved the game