EM9191 unstable after possible bad firmware update

IoT Modules MC/EM Series
15

I upgrade from fw 01.07.19 to 03.09.xx, i don’t see such problem

I am wondering if particular 5G band is making the crash, you can lock to particular band to see what happens.
Here is an example to lock to n66 band:

//lock 5G n66 and LTE all band (new SKU:1104903)
at!band=13,1,"TEST",1,0000A7E2BB0F38DF,0000000000000042
at!band=13,1,"TEST",3,0000000000000000,0000000000000002
at!band=13,1,"TEST",4,0000000000000000,0000000000000002
at!band=13
at+cfun=0
at+Cfun=1
 
//lock 5G n66 and LTE all band (old SKU: 1104629)
at!band=13,1,"TEST",1,0000A3E2BB0F38DF,0000000000000042
at!band=13,1,"TEST",3,0000000000000000,0000000000000002
at!band=13,1,"TEST",4,0000000000000000,0000000000000002
at!band=13
at+cfun=0
at+Cfun=1
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