Due to Ethereum network overload there is about 30,000 unconfirmed transactions in the network - https://etherscan.io/chart/pendingtx.
About 10-20% of nodes may experience problems with syncing up to the latest network block, some of transactions are not propagating properly. These problems last since the beginning of January.
Automatic re-broadcasting was turned off to decrease the load. We started developing a new service that will help to mitigate these issues by dynamically setting gas price for transactions.