Quectel EC25-AUX cfun=4 after router reboot

Hello,
using 6.48.6 (long-term)
with Quetcel EC25AUXGAR08A04M1G

After the router reboot - the modem return to AT+CFUN=4

when I change it to AT+CFUN=1,1 - everything works
but then I reboot the router - same problem
what could be ?
**if I upgrade the modem to version 08A06 , it take the router ~ 2.5 min to find the modem
but the same problem , AT+CFUN=4

what am I missing?

Thanks,