It could be a Heat issue, if your cpu is overheating , need more thermal paste or you might just need to clean out you pc on the inside, alot of dust can build up on the fans and heat sink. Does it adventually unfreeze or just stay frozen? If it starts working after a bit it could be a ram / memory issue and does it freeze as soon as it boots up? or do you leave yer computer in sleep mode?
A heat issue? It only happens on first day boot.
I never leave my computer in sleep mode and when it freezes, it stay frozen until i turn off. After the second boot, my computer has a normal functionality.