SKNMC Cell Line HELP?

[Lois C. Rich]

I am presently working with these cells in tissue culture- from the ATCC. 
They are giving m problems growing and splitting.  I am growing them in
Eagle's MEM + Earles, _ nonessential amino acids + pyruvate + 10% FCS. 
They slough when they are near confluence.  Any ideas out there?
TIA

Lois C. Rich
Dept. of Metabolic Diseases
Bristol-Myers Squibb
Princeton. NJ