It is common for airliners to be left powered on while parked at airport gates so maintainers can carry out routine systems checks between flights, especially if the aircraft is plugged into ground power.
The Airbus A350-941s had a similar bug and needed to be rebooted before reaching 149 uptime hours : https://www.theregister.com/2019/07/25/a350_power_cycle_software_bug_149_hours/
The remedy for the A350-941 problem is straightforward according to the AD (airworthiness directive) :
- install updates
- or "turn it off and on again"