Exclamation point warning?

When I sew fast (foot to the floor and speed on the machine set to the fastest speed-lever all the way to the right) my machine starts beeping really fast and an exclamation point blinks on the screen. When I look that up in the manual it says to look in the trouble shooting guide for answers on how to fix it. When I look in the trouble shooting guide there is nothing referring to page 65/66 of the manual and nothing relating to the error message I have received.

If I sew fast (foot to the floor) with the speed in the middle I do not get the error message. As a very experienced seamstress I do not have the patience nor do I have the time to sew this slow. If my machine is giving me the option to sew faster I want and NEED to sew faster.