Regional Jet 700 ER/LR (CRJ700)
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface
Aircraft Equipment Problem Less Severe; Deviation - Altitude Overshoot; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Overcame Equipment Problem; Flight Crew Returned To Clearance
Aircraft; Human Factors; Environment - Non Weather Related
While descending on the GIBBZ3 we were assigned by ATC to cross and maintain 6;000 ft. at GIBBZ but while leveling off at 6;000 ft. we encountered wake from another aircraft and the autopilot continued descending through 6;000 ft. and I caught it and stopped it. The Captain stated he would write it up with Maintenance for being a faulty autopilot. Also moments later while on the GIBBZ3 arrival over SUNYJ while initially setup for Runway 19C; we were told to switch to Runway 19R (the overflow runway) as the Controller indicated it would be much faster for us. While setting up the FMS for Runway 19R the Captain stated that our FMS briefly 'blacked out' on him which left us briefly in HDG Mode; as opposed to (FMS Mode) following the depicted track on the GIBBZ3 arrival to UDIYU and MATTC. The Controller vectored us back onto the arrival with two headings and we agreed it would be best fill out a report for what appeared to be a faulty FMS and faulty autopilot.
CRJ700 First Officer reported that an FMS malfunction resulted in an altitude and course deviation.