WARNING: CNORMN: search vector ill defined - for larger system

[GRYTSYSY]

Dear all,
I did calculation for system CoO/Ni that has 541 atoms and I got good convergence. But, when I only increased number of atoms, making more layers of bulk CoO in structure, I got the next message after 21 ionic iterations:

1.RMM: 43 -0.564474633929E+05 0.18225E+03 -0.99538E+00 25282 0.110E+00 0.122E+03
RMM: 44 -0.560694026789E+05 0.37806E+03 -0.63567E+00 25428 0.118E+00 0.121E+03
RMM: 45 -0.560080901096E+05 0.61313E+02 -0.26264E+00 25543 0.844E-01 0.121E+03
RMM: 46 -0.559562171658E+05 0.51873E+02 -0.18669E+01 20448 0.230E+00 0.121E+03

WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
WARNING: CNORMN: search vector ill defined
.................................................................................

Than, after 21 iterations, after that massage, I increased number of nodes from 128 to 256 and I didn't get that massage, but I didn't get convergence too even after 50 iterations.
Why I didn't get that problem for system with 541 atoms, only for larger one? Why result depends on number of nodes that I use?

I used gamma version of VASP.
Here is the next my input information:
INCAR:

# SCF input for VASP

# Note that VASP uses the FIRST occurence of a keyword

SYSTEM = Co300 Ni216 O325 (P3) ~ CoONi (VASP)

PREC = Normal

ENCUT = 400.000

IBRION = 2

NSW = 100

NELMIN = 2

EDIFF = 1.0e-03

EDIFFG = -0.25

VOSKOWN = 1

NBLOCK = 1

NELM = 60

# ALGO = Normal (blocked Davidson)

ISPIN = 2

INIWAV = 1

ISTART = 0

ICHARG = 2

MAGMOM = 25*3 25*-3 25*3 25*-3 25*3 25*-3 25*3 25*-3 25*3 25*-3 25*3 25*-3 216*2 325*0

LWAVE = .TRUE.

LCHARG = .TRUE.

ADDGRID = .FALSE.

ISMEAR = 1

SIGMA = 0.2

LREAL = Auto

NPAR = 16

ALGO = Fast

LPANE = F

KPOINT
Automatic mesh

0

Gamma

1 1 1

0. 0. 0.

If you need any additional information, please let me know.
best wishes,
Sergiy

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