Hi, thank you for contacting JustAnswer.com. My name is Russell. I feel that you deserve some sort of response to your question, despite it having been solved already.
With any new piece of equipment, there is always some uncertainty as to whether it is actually fully working. In this case, you might still have a slightly 'flakey' or unreliable monitor. I would advise you to watch it in the next few days for any other signs of reluctance to operate properly, etc. If it continues to be troublesome, return it as defective, of course, or return it for an exchange for another (fully working) monitor of the same type or equivalent capability.