My 3TB External keeps randomly unmounting

Every day my external plugged in via USB to my Raspberry Pi unmounts with this error

Error #6000:exception 'OMVException' with message 'Failed to get the 'ntfs' filesystem implementation or '/dev/sda1' does not exist' in /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc:98Stack trace:#0 [internal function]: OMVRpcServiceFileSystemMgmt->enumerateFilesystems(NULL, Array)#1 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)#2 /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc(307): OMVRpcServiceAbstract->callMethod('enumerateFilesy...', NULL, Array)#3 [internal function]: OMVRpcServiceFileSystemMgmt->getList(Array, Array)#4 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)#5 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('getList', Array, Array)#6 /usr/sbin/omv-engined(500): OMVRpc::exec('FileSystemMgmt', 'getList', Array, Array, 1)#7 {main}

And when i try to remount i get this error

Error #6000:exception 'OMVException' with message 'Failed to umount '/media/12A8026BA8024E23': umount: /media/12A8026BA8024E23: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1))' in /usr/share/openmediavault/engined/rpc/filesystemmgmt.inc:891Stack trace:#0 [internal function]: OMVRpcServiceFileSystemMgmt->mount(Array, Array)#1 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)#2 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('mount', Array, Array)#3 /usr/sbin/omv-engined(500): OMVRpc::exec('FileSystemMgmt', 'mount', Array, Array, 1)#4 {main}

You're probably right. I made it so it never spins down, But It may just be an issue with it being NTFS. I think I'm gonna hook up another drive to and format it differently.

I figured it out! It turns out when i leave something connected to it i.e Samba or FTP and I don't eject it and leave it idle, it'll disconnect like it does. After always ejecting after a file transfer it's fine. Any clue why this is happening??