I was able to figure it out for my situation. I synced it with Outlook. I opened the calendar in Outlook and filtered it by recurring appointments. Some of the appointments (the ones that were causing problems) were listed with a very odd end date. Something like in the year 4050. I had to update those to no end date and it solved the problem. There were about 10 of them - birthdays. I don't know how it got that end date but I just wated to post my fix here. Hope it helps.