We are aware of issues effecting instances and are currently investigating and working to have the issues resolved as soon as possible. Thank you for your patience and understanding during this incident and we apologize for the ... Continue reading...
I think this was affecting the Ark instances too - people were reporting some crashing. I recommend focusing on the solo instances if there's a risk of crashing (the ones where you get loot on each mob) until they get this sorted out. This way if it crashes partway through, you don't lose all your loot. Though... if they have disabled the enigma instances which were causing problems, maybe ours will be fine now.