G.M.
My daughter is 7 and we started her on Miralax last fall. We had potty issues for over a year, and it wasn't until we moved and got a new doctor that he ordered an ultra sound and found compacted poop in her rectum and this was also preventing her from emptying her bladder. We have had the same experience when stopping over school breaks. So we try not to forget to give it to her. I started sending an apple everyday for her snack (extra fiber) and changed her bread to the extra fiber kind also. Your not alone!