NodeMCU board

I have a NodeMCU board that when first powered up, there is a quick flashing light to connect to internet(esp 12 LED -gpio2.)

My board gets connected, as confirmed on my router.    However, I still get an intermittent flashing blue light from the that same LED that  now flashes about every 5-6 seconds .

Does that indicate anything.   I also noted that my door sensors not working and think that there may be an association .   Does my NodeMCU board need to be flashed again?