IHD beeping uncontrollably!

My IHD is beeping like a maniac! Its shifting from screen to screen, of its own accord. Has anyone else had this problem, and how do you fix it?

If it won’t power off, unplug it and throw it in a drawer until the battery dies!

Matt - Had the same thing.
Turned audio tones off & raised the budget limit - now waiting to see what happens, only plugged it back in 15 minutes ago.