Please send the smaller amount. For more information, please read this https://github.com/zcash/zcash/issues/1970.
The limit on sending is due to the size of the incoming tx’s. Its not a limit on the number of XSG you are trying to send.
If you want to send larger quantities you will need to consolidate your XSG into larger incoming tx’s into the address.
If you mine to a pool and get 100’s of small tx’s you can send small batches into a different address in your wallet. Then send a larger tx where you want it to go from your consolidated address.
It is just the nature of how a block chain works.
Please follow the guide here.
Most likely you will need to re-index the Wallet, please follow the guide here.
To send Masternode rewards you need to shield them first, please follow the guide here.
In some cases you may need to "reindex" you wallet in case of data corruption, please follow guide here.
You may have to upgrade your wallet and reindex, please follow the guide here to reindex using the CLI.