yam miner still not stabil right now??

i have 4 dedicated server..
1 server working fine with yam miner..and fast found share


NRS Agg. CPM: 140.0; Rnds C/I: 2903/311, Don. C/I: 59/11; Cfg/Thr CPM: 155.1/13.297 141 rnds AV=5, ART=18625; FT AV/RT: 5/18721, Best AV/RT: 2/18681
  nrs.blockquarry.com: On-line, Shares Submitted 129, Accepted 128
  nrs.flipsidemining.com: Idle, Shares Submitted 7, Accepted 7





but 3 server not working with yam
always show ...

NRS Agg. CPM: 0.2; Rnds C/I: 0/31, Don. C/I: 0/38; Cfg/Thr CPM: 0.2/? 0 rnds AV=1, ART=?; FT AV/RT: 1/0, Best AV/RT: 1/0
  nrs.blockquarry.com: On-line, Shares Submitted 0, Accepted 0
  nrs.flipsidemining.com: On-line, Shares Submitted 0, Accepted 0


same cfg ..btw