Character started falling through terrain

Don't respond if you don't have an answer or cannot comprehend the question.

1, Character has not had any changes, neither has the scene or anything in it. 2; I was moving the character around the scene fine and saved things. 3; I restarted the project again a couple of days later to "fix" some texture problems and the character was still fine and the textures had nothing to do with the character. 4; The collider is not set trigger, and as said nothing was changed on the character AT ALL. 5; Al;l of a sudden, lo and behold, I start project up and now upon start the character shoots through the terrain into free fall and wont stop doing that when i turn the game on and its pissing me off this crap randomly starts up in Unity.

How the hell do i "Restore" this and stop the character from randomly falling through the ground and don't tell me nonsense like "it must be" too close to the ground. You obviously have not read what I wrote and have stated. If you are not sure what I am saying, re-read. Its not that difficult to comprehend the problem. I want a solution, not stupid comments.