Back on original topic 
(will open a new one for signal issue thanks )
Quectel, please do and check that recovery/return of ca after few minutes on your side.
My current signals are -81db (for B7 and better for lower bands and after 3-5minutes my CA disconnects and never return even if I download bit ftp/torrent file".
At old EP06-A any speedtest do comeback scc, this EG12 have CA only in first minutes of if I do massive traffic from start… but if I pause and wait 5m then he never return 
This is main problem and he is like a bug.
Thanks.