When I turn on the laptop the a letter key and the ` key dont respond. After 10-15 minutes they respond. I don't think its from the keyboard I replaced it last year and its not dusty. Also after some use randomly the laptop freezes and not everytime but sometimes the fans are going high and when it freezes like that you can't do anything, you have to turn off from the power button and turn on the laptop again. I checked for viruses, checked for hard drive health and memory diagnostic. Nothing there.
The operating system is Windows 10x64 pro