Looks like it’s solved!
That package (crda) wasn’t installed but anyway eth and wifi sometimes worked, sometimes it isn’t, now I’ve installed «crda» and tested four times without problem.
Anyway, I’d tried with «manjaro-arm-installer» and with this Manjaro img file, issues unveiled after upgrade was done.
Thank you!
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That file is half a year old. Please always use the current images when re-installing. 
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We have a new RPi4 Gnome image build ready. Please try 21.07. in our tests it performed well.
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Thanks for the raspberry gnome release! i’ve send my coments for you inbox, since it follows our discussion of the brazilian sway keyboard layout.