Hi, It appears a metallic oscillation, where a couple or more states change their relative energy, and change their energetical order, then the occupation changes abruptly (non continuous). If this is the problem, it is better to increase the degauss value and/or change the smearing method. Typically I use methfessel-paxton with 0.015 Ry for degauss, which mimics the VASP default values. When you get a converged system, you can try to decrease (slowly) the degauss.
Regards - Lucas Lodeiro
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