Computers are multiple layers of massive complexity. Somewhere in that complex stack it's very easy for 'something' to go wrong.
When it's first turned on the computer works, so it's clear that there's an initial 'state' where all those layers of complexity are in alignment. Turning it off and on again is the best way to try and replicate that initial successful state.
Depends on when it is made. Anything made before 2003 is still broken when you turn it on again.
Thermostats didn't take a vaction and leave you frozen till it was replaced. Toasters didn't crash and require firmwares to work again. Washers used mechanical switches that didn't need software to work. But yes, go ahead and believe this is normal.