This is a 4-5 year old Dell E6230 that I bought used 3 year ago. It's on Windows 10 and has a SSD. About a minute after I start it, it freezes up. I then hold down the power button until it shuts off, then restart it. Then it works fine. Same thing happens when it's been in sleep mode. I've run the usual virus scans. It's not a terrible inconvenience, but annoying never the less. Don't remember when this started but not worth taking it in to a shop. Any idea for the cause and what to do to stop it?