Blockchain.info just concluded a stress test and i guess it is now better than before but what you encounter might also be as a result of your home internet network because it happened to me also.
No, blockchain is not conducting a stress test. For the past couple of days, an individual has been conducting a malleability attack on the network, and the outcome are the missing and double transactions found on blockchain.info, as well as other explorers.
If you are completely unfamiliar with the issue, essentially someone is broadcasting each transaction after it takes place separately, so that if his malicious transaction is processed first, the original transaction is not processed, and the wallets and explorers do not broadcast the transaction as taking place at all.
