ORD Profile disappears

My profiles have disappeared from my drawing. I am working in ORD 2019 rel 1. I created profiles successfully using the Named Boundary command. The drawing model and sheet model looked good at first. When I restarted my computer the next day and opened the profile drawing, my profiles were missing. The drawing model still has the annotation for the profile, but my existing ground and proposed grade linework is gone. From the drawing model the reference for the profile says "Model not found - (AttachedLongSection)". I don't have the option to Reload the reference. I created a new profile successfully. I restarted my computer twice. The profile linework disappeared again. Does anyone have an idea what is happening?