One cannot prevent orphan blocks from happening since they are a part of the system as it was intended. Orphan blocks are blocks that you and someone else minted at the roughly same time, but the other party was "quicker" to confirm the block in the blockchain, making the block you minted orphan. Since most of the work is done by the network and the wallets, you cannot do much about that apart from keeping your wallet online and available 24/7 on a healthy computer and a healthy Internet (up)link (which one should be trying to do all of the time anyway).