I have been staking smoothly 18 days but today staking isn't active. what's the problem?
maybe all ur coins staked already (are in inmature state)
once they become mature again they can compete for finding POS blocks again
No they are mature.I created new address and sent them but still isn't active.
restart wallet
wait 2 min after full sync before unlock in "only for" mode
after a fresh transaction coins also need some age before they can start minting (i guess its 1 hour)
If this does not work, click on tools, wallet repair, recover transactions=1. The wallet will restart. Let it sync, and then try. If your still having troubles, just message here.