I'd be interested in hearing what it takes to fix this.I called Walther this morning, and had the good luck to end up with the right guy there, who understood and has dealt with this problem before. It is clearly obvious (now) that when I press the trigger with the tiniest amount of sideward pressure, the striker isn't doing its thing properly, probably, due to some tolerance stacking per this guy. Hopefully they can fix it.
Please report back on what parts are replaced or adjusted etc.