vmu dont turn off

hello everyone i just got a dreamcast and im really impressed with the graphics. this is my first post to the forums. i went out and bought a new sega vmu. i replaced the batteries and turns on and save games just fine. i have another sega vmu plugged in to port a and the one i just bought goes in to port b. whenever i shut down my dreamcast port a vmu turns off but the vmu in port b stays on. is there something wrong with the vmu i just bought?

Press the Sleep button

i know i can turn off the vmu with the sleep button but how come the vmu in port a turns off when i shut down my dreamcast but the one on port b stays on. port b is the one i just recently bought.

Did you configure the setting on the vmu already? (time etc)

yup i did the formatting and the time.