Zcash-Wallet unavailable ZECs rising

I use the standard shell-wallet on Ubuntu.

I have installed this a year ago with APT, so I receive frequently updates.

I mine on this wallet via flypool.

My problem: The amount of ZEC which I can’t send rises. So I have meanwhile 0.04 ZEC which I can’t send.
If I try to send it, I receive a failed-message which inform me that I have not enough money.

What can I do?

./src/zcash-cli listunspent
Check the addresses. You may have it in change addresses.