Since 3 days, in Zcoin mining in miningpoolhub, I do 30% less than before..

Since 20 days, I earn my 0.12 XZC / day ( @2800 khs ), but since 16 th december, the pool reports me only 0.75 XZC..
The hashrate is still the same, and the miner is the same too ( djm34 ccminer, and I tried too latest tpruvot 2.2.3 )

Do you have the same issue ?