Now I`m calculating some large systems composed of CNTs and some organic molecules using M052x / 3-21G functional level .... My system also includes a transition metal ..... The main problem is always the convergence 

Even though I`ve tried many different key words i.e.

SCF=maxcycle=1024

SCF=maxcycle=2048

SCF=maxcycle=3000

SCF=QC

SCF =XQC 

But unfortunately, always get the same termination error 

Error: software termination

rax fffffffffffffffc, rbx 0000000000000001, rcx ffffffffffffffff

rdx 0000000000000000, rsp 00007fff3b68e180, rbp 00007fff3b68e250

rsi 00007fff3b68e31c, rdi 00000000000040a4, r8 0000003da458fc00

r9 0000000000000020, r10 0000000000000000, r11 0000000000000246

r12 00007fff3b68e31c, r13 0000000000000076, r14 0000000000000000

r15 00007fff3b694bc0

Error: software termination

rax 0000000000004908, rbx 0000000000000000, rcx 0000000000011d2e

rdx 00002af1d62e7ed8, rsp 00007fffd346a6e0, rbp 00007fffd346a950

rsi 0000000000000001, rdi 0000000000000005, r8 0000000000000007

r9 0000000000000002, r10 0000000000000002, r11 0000000000000004

r12 00002af1d63932a8, r13 000000000000ace7, r14 00007fffd346b7b8

r15 00002af1d5a40eb0

Any recommendations will be highly appreciated 

Thanks in advance 

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