Switching sim slot via script, lte-error in log?

When i change the sim-slot (ltAP, ros 7.20.7) via script like:

/interface lte set lte1 apn-profiles=HoT
/interface lte settings set sim-slot=down

it works, but i have always an error in the log:

lte1: no response for: AT+CFUN=0

Modem Firmware V039 (R11e-LTE6). Any ideas ?

br, Richard

Ignore the error?