Yes, please get in touch with his doctor. My DH was doing that about a year ago and that is when his dr. diagnosed the Parkinson's. That doesn't mean that your DH is check it out.
I think they just don't get the message from the brain to keep holding the item. Lloyd has been dropping things for about a year. I still occasionally let him hold a glass to drink, but I am right there to catch it if he drops it. If he has a myoclonic jerk, there is nothing I can do except clean up.