Voters in Texas who use the straight-ticket device are sometimes finding that the device doesn’t work. This year, some voters who push the Republican straight-ticket button end up casting no vote for U.S. Senate. And some voters who push the Democratic button end up voting for Ted Cruz, Republican, for U.S. Senate. See this story. Thanks to Rick Hasen for the link.
As the story says, this is the last year the device is being used in Texas. The legislature repealed it in 2017 but made that change effective after the 2018 election is over. The story does not say, but it could have said, that voters this year should simply not use the device.