I got very strange problem: (See)
Share found! (Blockheight: 22917)
kHash/s: 1034.78 Shares total: 71
kHash/s: 1034.79 Shares total: 71
kHash/s: 0.36 Shares total: 71
kHash/s: 2.36 Shares total: 71
Share found! (Blockheight: 22917)
kHash/s: 4.34 Shares total: 72
Share found! (Blockheight: 22917)
kHash/s: 6.29 Shares total: 73
kHash/s: 8.27 Shares total: 73
Share found! (Blockheight: 22917)
kHash/s: 10.22 Shares total: 74
Some how the kHash/s goes to lowest (from 1000kHash to 0.5kHash) and then gradually go up to a few hundert. But the share value in ypool doesn't change so I assume it is just a glitch
On the linux build there's an issue with the average hash rate calculation. Long story short, because it calculates the average hash rate as "total hashes / total time", after a long enough period the value of "total hashes" overflows back to zero. It's just a graphical bug (you can check your shares/hour on yPool if you're not sure).
I just updated the github to fix it, so rebuild and you should be good to go.