I don't know that specs would be required.
I think a reasonable argument could be made that airplanes are resistant to air surveillance and weather radar (arguably WiFi too for a passenger jet, but I'd think those other two are un ambiguous, though it should be assumed that there's at the very least accidental WiFi on, permitted or not) to be fit for the purpose in which they are sold, making it an issue of implied warranty.
If Boeing purchased these with the stated purpose being the cockpit, I don't think speccing enters into the equation, these are things that a reasonable person assumes are fine for a display, especially if it's being sold for flight. Nobody requested in the spec it not randomly turn off for no reason, but if that was the problem I'd assume it would be unambiguous too, it's implied that they will operate, and operate in the environment for which they were sold.
It is Boeing's job to make the airlines whole (if it's determined that they are indeed unacceptable), and Honneywell's job to make Boeing whole.