I have the same issue... but only with some of the transactions I make. I made no changes in paths or whatever and the problem continues after updating Bitcoin Core from v11.0 to v11.1. It has nothing to do with the address I send to or from or the amount send because sometimes it works sometimes it don't 
@CircusPeanut I had the issue before updating to v11.1 so I don't think it is caused by v11.1
To work around this problem when I really need to send asap I make an offline tx - sign it- copy the raw hex - and broadcast it on https://blockchain.info/pushtx it gets broadcasted but 90% the tx changes because of a conflicting tx.
@CircusPeanut I had the issue before updating to v11.1 so I don't think it is caused by v11.1
To work around this problem when I really need to send asap I make an offline tx - sign it- copy the raw hex - and broadcast it on https://blockchain.info/pushtx it gets broadcasted but 90% the tx changes because of a conflicting tx.