The US Federal Aviation Administration has ordered Boeing 787 operators to switch their aircraft off and on every 51 days to prevent what it called "several potentially catastrophic failure scenarios" – including the crashing of onboard network switches.
https://www.theregister.co.uk/2020/04/02/boeing_787_power_cycle_51_days_stale_data/
https://www.theregister.co.uk/2020/04/02/boeing_787_power_cycle_51_days_stale_data/