I think I may have noticed this happening too - but with the 512kB firmware in my case (so it's presumably not specifically related to the 4M image)
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I think I may have noticed this happening too - but with the 512kB firmware in my case (so it's presumably not specifically related to the 4M image)