How are activity calculated?

Premium prevents you getting negative SL at end of match as long as you dont team kill

I have premium, and it didn’t.

I suppose I have to turn auto repair on for this?

yes

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If you mean premium unit then no, premium account then its automatic. Show us a screen shot of battle report from your mail box

Is that worth turning it on again?

If you are on premium time yes. It made sense before to leave it off because you could save a little SL between each game if you left it manual. Now there’s not really any benefit.