Wouldn't surprise me. Here lately it's been timing out into a blank screen when I click on My Disney Experience. I end up going back and clicking directly on My Reservations.
It experiences a lot of traffic. Especially due to all the online stuff for dining, FP+ and memory maker. Everyone at the park is on it, as are people browsing and people planning trips. Day time and evening around 10am-11pm EST are peak use times.