plugging it and unplugging it. spilling water on it, humidity, high usage constantly, operating at extreme temps. the usual computer problems
The hub bearing can go bad and create noise.
Thermocycling.
There can be a few reasons for a catalytic converter to go bad. One of the causes could be clogs. Other reasons include plugs not working right, and bad exhaust valves.
They get soggy in damp weather.
A bad transmission.
The PS3 does not have a router. It can go online with an ethernet cable connected to a router or modem or with WiFi from a wireless router or modem
if modem has wireless capability then a router is not needed
Bad groung and or bad sending unit.
Low fluid and dirty fluids.
Bad electrical fixtures.
Old age. Wear. Abuse.
If your router keeps shutting off and rebooting, when you try and access WiFi, it sounds like your router is bad. Another sign the router is bad is your ability to use a wired connection without a problem.