Last week the monorail was down every morning that we wanted early entry into the parks, and the sign said operating at 8:30 AM. To be honest, the bus rides to Epcot were way quicker than using the monorail and had us to the park in plenty of time.
I can also say that for the week we were there were no issues with the service until yesterday. The Express monorail as well as the resort loop monorail experienced a breakdown. At the same time. I would not have cared but we had to catch DME and I hate to be rushed.