Hi guys,
new miner here. Just started 3,4 days ago. I have a question that might be dumb but wasn’t able to find any good answer to it while looking around. So i mined 24h Lbry with 100% efficiency on suprnova and decided to try mine Zcash for next 24h. What worries me is that efficiency is less than 100% ( i got some invalid shares or been rejected not sure). Is that normal for mining Zcash or something is wrong with my miner,rig or software… 
It moves up and down around 98+% saw it 100% for a few minutes then dropped again.
WUUUUUUUUUUUUUUUUUUUT
It could be your internet connection. You can lower the difficulty too, it may help.
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as long as u keep it under 5% its ok… If its over 5%, then u have some sort of problem (internet, clocks etc.)
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Thanks! It didn’t cross more than 1.5% for the last 16hours! 
Mining is a roller coaster up and down 
So don`t worry.
As others suggested as long as you keep it 90% and above should be good. Just monitor every couple of days.
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Zcash difficulty is a roller coaster sincerely I don’t really want to see price rise followed by a big amount of new miners
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