Google let me down badly today and yesterday when it wouldn't load traffic info.
I don't use it much but I needed it today again to pre plan at short notice knowing there were traffic problems from yesterday.
I survived by old fashioned knowledge, guess work and instinct today and found a good if convoluted route, but yesterday was carnage, though again it literally would have taken 5 times longer if I didn't take a last slip exit before being trapped and work around.
First blame maybe the network / carrier sure, but if Google is loading Sat Nav location it's using data anyway, and traffic usually loads quickly.