Embraer Jet Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Situational Awareness; Confusion
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Became Reoriented; Flight Crew Requested ATC Assistance / Clarification
Human Factors; Procedure; Chart Or Publication; Aircraft
After getting cleared direct to KZLOV on the LIDDS1 departure the next 2 fixes apparently somehow dropped out of the flight plan unknown to us. The full departure was loaded in the FMS and checked.  We were told we did not have to follow the altitude restriction and to resume normal speed.  We were on course to LIDDS and then apparently NOONR and ZEYOU were missing; as Pilot Monitoring I did not notice that and we were on course for GRIVY when ATC asked.  After speaking with the Center Duty Manager he indicated to me that this has been occurring and they are trying to figure out why.  It appears that the database dropped those fixes which is what he indicated other crews have told him.  We departed Runway 22L and again we had checked the fixes. This should be added to 10-7 company pages to watch out for.
Second narrative contains no additional information.
A Flight Crew reported two fixes in their flight plan dropped out of their FMC causing them to fly off course.