I've been trying to differentiating SH-SY5Y cells with brain-derived neurotrophic factor (BDNF) in 8-well chamber slides but I seem to be having problems with cells detaching over the course of the 7 days in serum-free media with BDNF. The problem seems to be more apparent after changing the media but I am unsure as to why this would occur and would value any insight from people with similar problems with SH-SY5Y or other cell types. My first thought was that I was removing too much media from the well, so I began to leave around 1/4 of the old media and add 3/4 new media and pipette the media off very slowly and add the new media very slowly (to the side of the well, not directly on to the top of the cells) but I still seem to be having the same issue. I thought there might be a problem with the incubator I was using so I changed incubators, and yet the problem persists.