With mechanical stuff you take it apart, clean it, replace what is obviously worn or broken and put it together again.
you power cycle to restore the memory that leaked away due to bad programming and hope it works again for a while. Occasionally you load a new firmware version and hope it will run longer. Technology runs so fast that new firmware versions are rare, you just buy the newer, better cheaper model.
A dirty secret in IT is they regularly power cycle their routers. Sort of like changing the fuel
I am so happy I have a 1984 vintage diesel that uses a tractor block and that does not use electronics
and I can fix myself.