CME ERROR: SIM busy

[michaelboeding]

U_CELL_PWR: powering on.
[00]AT
AT
AT
AT
AT

OK
U_CELL_PWR: powering on, module is alive.
ATE0

OK
AT+CMEE=2

OK
AT+UDCONF=1,0

OK
ATI9

01.24,A01.00

OK
AT&C1

+CME ERROR: SIM busy
AT&C1

+CME ERROR: SIM busy
AT&C1

ERROR
AT

OK

On the SARAR422S (01.24,A01.00) im running into a SIM busy error sometimes. Is there anything I can to to prevent or reduce this? And what are the expected actions I should take when this happens?