Don't know if this is similar to your problem or not.  Twice this year,we have started the sprayer more quickly than our usual routine. 2600 display appeared to working,   well   sort of. But some buttons and features were unresponsive. Then tried turning the key off, but display would not shut down. One time we pressed the reset button on the back and the other time I disconected the harness,to reboot it. First time I lost coverage map on the large field I was working on,next time no loss of data.Second time I had it set on a "test" or fake field.

Now I always set the display to a very small "test" field  before shutdown. And now we find the best way to start up is to just turn the key on,"so everything boots up" wait about 5 seconds more,then start the machine. This method has never given us trouble. We have only had trouble when we start the machine by turning the key quickly or sort of quickly.