If like James thinks, is an aluminum plate, and it sagged, I would be contacting Kreg about the situation. If it's a phenolic/plastic plate, welcome to the world of sagging router plates. Speaking of Kreg and a slight hijack. Is their quality slipping? They tout their Kreg Jig screws as being super strong and break resistant. I've not found them so even using my little DeWalt 7.2V screw driver and with the big Bosch demolishing them.
Quando omni flunkus, moritati (When all else fails, play dead - R Green)