Having the same problem but thought it was birds doing it as there would be just a puncture in each one. Also have a baby bunny that has found a hole in my chicken wire/picket fence too. Soon he'll be too large to get thru his secret opening though. Seems this year its taken forever for our tomatoes to ripen. Have plenty on the vine and its just been recently that they have been turning red for me. Now its canning time................finally.
I also have been picking them as soon as they start to show color and let them finish turning inside.