An interesting comment on avherald, worth repeating here:
year ago same/similar situation happen in MXP (milan). Three different aircraft (MD80) with same simptom (pressing TO/GA push button pitch FD bar goes out of wiew on PFD's) While try to find out what's going wrong on the first two aircraft a therd aircraft called for same issue. We realized that the three aircraft was parcked with same "heading" and find out static port (MD80 have a pneumatic pipe line connection LH/RH static port's)pipe line blocked due ice.Very low temperature (high unidity) during night and wind blowing ortogonally respect the aircrafts position. Others same aircraft type parcked in different heading respect the three affected did not report issue