Start Up Problem

[cibolorider]

I own a 99 GZ250 I bought used in Oct. 2011. For the first 3 months I owned it wold always start with the slightest touch of the starter button regardless of weather or any other conditions. Suddenly one day it wouldn't start. All it would do is crank. I figured out that if I turned the kill switch off and then back on (sometimes more than once) it would start very quickly. And sometimes I have to turn the key switch off and then back on to get it to start. I have tried not using the kill switch and just turning off with the key but that doesn't change anything. I have read the owners manual on the proper procedure for start up and that doesn't help either. Has anyone else had this problem or can you give me any ideas?