Probably due to multipools putting AUR on their shortlists. Now that it's on exchanges it has a profitability value.
At the current time it has taken 2 hours to find the last 4 blocks, probably because the multipools have gone elsewhere once it's no longer immediately profitable. So loyal miners are left holding the bag. Then when difficulty drops significantly because of the excessive block times, the multipools will return, and the cycle repeats.
Pretty much the same thing is going to happen with any coin that doesn't have a per block retarget. Even 8 is too long.