Comments showing up on an Electrek post from someone who claims to be employed by Panasonic at the Gigafactory indicate problems with Panasonic's production at the Gigafactory, specifically with lack of competent American hires (he says the Japanese guys are great but many of the Americans they're trying to train are actually breaking things) and unreliable power supply.
These problems are serious, but IMO addressable in a reasonable timeframe if Musk steps in personally. He may have to make Panasonic raise pay in order to get people to move to the godforsaken nowhere where the Gigafactory is, or even build barracks due to a lack of housing in the area. He will probably have to install Powerpacks at the Gigafactory ASAP to stabilize the power supply.
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Oh -- also, I take Musk's personal relocation to the Gigafactory to indicate that any known Fremont problems are currently under control. While problems in Panasonic's battery production are in some ways more serious as they affect Powerpack/Powerwall production as well, they appear to be entirely due to incompetent hires and a flaky grid power supply... both of which should be solvable if Musk makes them his #1 priority.