D.N.
I went through the same thing with my daughter. She was potty trained fairly early and around the 4 year mark she started having a few accidents. However, it ended as quickly as it started. i asked her doctor and she said that this occurs to children who were potty trained early and that it is completely natural. It will end. Its just a part of a child adapting to changes in their bodies and surrounding. It will pass. Good Luck! My daughter is 8 yrs now and hasn't had any problems like that in school.