Probably nothing to worry about. Once you've hit phase 3, that's an indication you're in the que for production and your paperwork is all in order. Many of us have experience with dropping back to Phase 1 (I panicked!), but it is almost always due to a problem with the Phase System Software/Database. Try again at a later time and see if it's okay. And - for peace of mind, don't hesitate to give 'em a call to find out what's going on.
Congrats on the new m5500 - that's a very nice system!