Our wallet had become excessively bloated resulting in some slightly delayed deposit crediting. When you hit deposit you should be assigned a new address. If you happen to send to an old address, it still should credit for the next week or so.
Are not you using blockchain.info API ?
BlockChain.info is terrible with our eyes nowadays, it downs frequently and sometimes rejectes my access with some unreasonable reasons.
for me blockchain.info that issue was few days before but after there is no such kind of issue with using that, maybe sometime you have problem with your internet connectivity or like that.