10 month sleep patterns?

Anyone else out there whose 10 month old wakes up at a certain time every night after you've already put the down for the night? We sleep trained my daughter and got her sleeping through the night around 4 months. Since then she has been able to consistently put herself to sleep and back to sleep when she would wake up at night. Now the last several days in a row she has woken up around 11 and cried hard until I go in there to comfort her. I haven't been letting her cey very long before getting her because she is still pretty good at putting herself back to sleep so I don't feel like its a big deal to just get her up and feed her again. But I'm curious to see if this is normal and I wonder if I should try to train her again-like waiting longer to get her up each night until she soothe herself back to sleep. Has this

happened to anyone else?