My 2 months old BMV-712 Smart does not respond to the hardware buttons on the display anymore. Following the latest firmware update it was initially working fine, but is now stuck showing usage / yield in Watts. The app on the other hand is still fully functional, so power, bluetooth and connection to the shunt can't be the issue. It's almost like the hardware buttons were disabled by command, but I haven't seen any option in the manual to do this. Is there a way to enable/disable the buttons?