Roger says that when he puts his Asus laptop into hibernation, when it wakes up, it reboots. Leo says it sounds like Windows power and sleep issues, which have been a common malady in the operating system. Leo says he should look in his power settings to see what it's set for. It sounds like it turns itself off instead of going to sleep.
Roger should take it in and have a technician look at it. Before he does though, he should back up his data and do a complete restore. If it works fine after that, then it was a software issue. If it still happens, then it's hardware. He could also look in the event log to see what is happening.