Nat Geo 7-in-1 baro issue

[G4WFT2]

I've recently installed a National Geographic 7-in-1 weather station (made by Bresser, I believe).  Its been working fine and I calibrated the baro sensor from nearby professional stations.  I did this by applying an offset to the relative pressure value, which is the pressure corrected to mean sea level I think?

This morning, around 0830, the indicated pressure suddenly jumped up by 7 hPa!  I also noticed that the wind speed units had changed from mph to m/s and light intensity units from W/m2 to kLux.

I've no prior experience with this station, having used Davis equipment previously.  Anyone know if this is generally reliable?  I've applied a new offset to bring the indicated pressure back to the correct value and reset the wind speed and light intensity units but this is somewhat disconcerting!