Meanings of still spotty in English

My memories of the few days prior to the accident were still spotty.

His hair was getting long, but his beard was still spotty.

The economic growth trend is still spotty.

The main complaint is the power grid: electricity is still spotty, and the Army has delivered generators as a stopgap measure.

The effort, from Al Jazeera Labs, just got started; the reporting is still spotty, and the technology is very much in the testing phase.

During their nighttime escape over the mountains, they'd had little time for such conversations, and so their knowledge of Digger culture was still spotty.

My memory is still spotty but I remember shooting at least one of them at point-blank range right through the glass, killing it instantly.