Problem with multiple download from samba share

hi,
if I select some files in a folder belonging to a samba share and download them, everything works fine.
If I select all files in a local folder and download them, everything works fine,
but if I select all files in a folder belonging to a samba share and try to download them, I get a page that says “read error”.
The log shows the following error:

{“reqId”:“rxx4kO9NvmRTvXqyoK1y”,“level”:3,“time”:“2020-01-29T11:53:51+00:00”,“remoteAddr”:“172.19.23.55”,“user”:“XXXXXXX”,“app”:“no app in context”,“method”:“GET”,“url”:"/index.php/apps/files/ajax/download.php?dir=%2FFSAMM%20%3A%3A%20File%20Server%20Amministrativo%2FSistInform_A&files=FOTO.ASSET&downloadStartSecret=r036opfb7q",“message”:{“Exception”:“Icewind\SMB\Exception\InvalidPathException”,“Message”:“Invalid request for Invalid path, “:” is not allowed (InvalidPathException)”,“Code”:0,“Trace”:[{“file”:"/var/www/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php",“line”:70,“function”:“verifyPath”,“class”:“Icewind\SMB\AbstractShare”,“type”:"->",“args”:["/SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php",“line”:133,“function”:“buildUrl”,“class”:“Icewind\SMB\Native\NativeShare”,“type”:"->",“args”:["/SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php",“line”:112,“function”:“getStat”,“class”:“Icewind\SMB\Native\NativeShare”,“type”:"->",“args”:["/SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/apps/files_external/lib/Lib/Storage/SMB.php",“line”:178,“function”:“stat”,“class”:“Icewind\SMB\Native\NativeShare”,“type”:"->",“args”:["/SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/apps/files_external/lib/Lib/Storage/SMB.php",“line”:526,“function”:“getFileInfo”,“class”:“OCA\Files_External\Lib\Storage\SMB”,“type”:"->",“args”:["/SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/lib/private/Files/Storage/Common.php",“line”:112,“function”:“filetype”,“class”:“OCA\Files_External\Lib\Storage\SMB”,“type”:"->",“args”:[“SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET”]},{“file”:"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php",“line”:112,“function”:“is_dir”,“class”:“OC\Files\Storage\Common”,“type”:"->",“args”:[“SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET”]},{“file”:"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Availability.php",“line”:128,“function”:“is_dir”,“class”:“OC\Files\Storage\Wrapper\Wrapper”,“type”:"->",“args”:[“SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET”]},{“file”:"/var/www/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php",“line”:112,“function”:“is_dir”,“class”:“OC\Files\Storage\Wrapper\Availability”,“type”:"->",“args”:[“SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET”]},{“file”:"/var/www/nextcloud/lib/private/Files/View.php",“line”:1160,“function”:“is_dir”,“class”:“OC\Files\Storage\Wrapper\Wrapper”,“type”:"->",“args”:[“SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET”]},{“file”:"/var/www/nextcloud/lib/private/Files/View.php",“line”:378,“function”:“basicOperation”,“class”:“OC\Files\View”,“type”:"->",“args”:[“is_dir”,"/FSAMM :: File Server Amministrativo/SistInform_A/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/lib/private/legacy/files.php",“line”:381,“function”:“is_dir”,“class”:“OC\Files\View”,“type”:"->",“args”:["/FSAMM :: File Server Amministrativo/SistInform_A//FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]},{“file”:"/var/www/nextcloud/lib/private/legacy/files.php",“line”:148,“function”:“lockFiles”,“class”:“OC_Files”,“type”:"::",“args”:[{“class”:“OC\Files\View”},"/FSAMM :: File Server Amministrativo/SistInform_A",["/FSAMM :: File Server Amministrativo/SistInform_A/FOTO.ASSET"]]},{“file”:"/var/www/nextcloud/apps/files/ajax/download.php",“line”:64,“function”:“get”,“class”:“OC_Files”,“type”:"::",“args”:["/FSAMM :: File Server Amministrativo/SistInform_A",“FOTO.ASSET”,{“head”:false}]},{“file”:"/var/www/nextcloud/lib/private/Route/Route.php",“line”:155,“args”:["/var/www/nextcloud/apps/files/ajax/download.php"],“function”:“require_once”},{“function”:“OC\Route\{closure}”,“class”:“OC\Route\Route”,“type”:"->",“args”:["*** sensitive parameters replaced ***"]},{“file”:"/var/www/nextcloud/lib/private/Route/Router.php",“line”:297,“function”:“call_user_func”,“args”:[{“class”:“Closure”},{"_route":“files_ajax_download”}]},{“file”:"/var/www/nextcloud/lib/base.php",“line”:997,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->",“args”:["/apps/files/ajax/download.php"]},{“file”:"/var/www/nextcloud/index.php",“line”:42,“function”:“handleRequest”,“class”:“OC”,“type”:"::",“args”:[]}],“File”:"/var/www/nextcloud/apps/files_external/3rdparty/icewind/smb/src/AbstractShare.php",“Line”:22,“CustomMessage”:"–"},“userAgent”:“Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/79.0.3945.79 Chrome/79.0.3945.79 Safari/537.36”,“version”:“17.0.2.1”}

Nextcloud version: 17.02
S.O versione ubuntu 18.04

config.php
$CONFIG = array (
‘instanceid’ => ‘xxxxxxxxxxx’,
‘passwordsalt’ => ‘Lq9cSeMJniJ1ix106jFwHYb/QExNxj’,
‘secret’ => ‘yY44HxSZ/3b+vxcvxcv9RCyYCw5bIfyUsAXhe9zHZO53zt9X’,
‘trusted_domains’ =>
array (
0 => ‘nextcloud-doc.xxxxxxxxxx’,
),
‘datadirectory’ => ‘/discodati_nc/datinextcloud’,
‘dbtype’ => ‘mysql’,
‘version’ => ‘17.0.2.1’,
‘overwrite.cli.url’ => ‘https://xxxxxxxxxxxx’,
‘dbname’ => ‘nextcloud’,
‘dbhost’ => ‘xxxxxxxxx’,
‘dbport’ => ‘’,
‘dbtableprefix’ => ‘oc_’,
‘mysql.utf8mb4’ => true,
‘dbuser’ => ‘nextcloud’,
‘dbpassword’ => ‘nextcloud’,
‘installed’ => true,
‘ldapIgnoreNamingRules’ => false,
‘ldapProviderFactory’ => ‘OCA\User_LDAP\LDAPProviderFactory’,
‘mail_from_address’ => ‘nextcloud-doc’,
‘mail_smtpmode’ => ‘smtp’,
‘mail_sendmailmode’ => ‘smtp’,
‘mail_domain’ => ‘xxxxxxxxxx’,
‘mail_smtphost’ => ‘xxxxxxxxxx’,
‘mail_smtpport’ => ‘25’,
‘maintenance’ => false,
‘theme’ => ‘’,
‘loglevel’ => ‘1’,
‘onlyoffice’ =>
array (
‘verify_peer_off’ => true,
),
‘filelocking.enabled’ => true,
‘memcache.local’ => ‘\OC\Memcache\Redis’,
‘memcache.distributed’ => ‘\OC\Memcache\Redis’,
‘memcache.locking’ => ‘\OC\Memcache\Redis’,
‘redis’ =>
array (
‘host’ => ‘localhost’,
‘port’ => 6379,
),
‘app_install_overwrite’ =>
array (
0 => ‘files_accesscontrol’,
),
‘updater.release.channel’ => ‘stable’,
‘updater.secret’ => ‘$2y$10$hUbErXHQIK1/0Sn3saR8x.tf67Q/BerVf7mjmCMXEM1jfijirXoz.’,
);

can someone help me?