Refiled I-485 on 11/23/2013, almost 5 months, called USCIS (Lincoln), got this letter again:
Based on your request we researched the status of this case. We actively processing this case. However, we have to perform additional review on the case and this has caused a longer processing time. If you don't receive a decision or other notice of action from us within 6 months of this letter, please call customer service at the number provided below.