[BenLurkin]

We had a crookneck squash plant just die. Leaves drooped, then wilted and then it croaked — all in less than 24 hours. The others in the bed are okay so far. Thought it might be gopher but the roots were fine.

[Miztiki]

Sounds like you might have a “squash vine borer”. You can learn about them by doing a google search. They’re not good.