Emperor's Demise - promotion fail/promotion error

Had similar problem, wouldn't let me promote EP to 7 stars and next time I logged in only had 15/100 shards and had about 800k credits missing. Gutted cos it won't even let me redo event to earn those shards back. A lot of people seem to having issues with this after looking on the forum. Hopefully EA can do something to sort this, lots of players have spent time and money on assembling a squad to be able to complete this event.