I assume this is running the x64 version of nextcloud?
i'm having issues with downloading large files > 10GB where i can download about 1-2GB and then it stops
EDIT:
this error shows up in the logs when it fails
Uncaught Error: Access to undeclared static property: OC\Files\Filesystem::$normalizedPathCache in /config/www/nextcloud/lib/private/Files/Filesystem.php:806 Stack trace: #0 /config/www/nextcloud/lib/private/Files/View.php(2018): OC\Files\Filesystem::normalizePath('/zepius/files/M...') #1 /config/www/nextcloud/lib/private/Files/View.php(1156): OC\Files\View->unlockFile('/Media/Movies/Z...', 1) #2 [internal function]: OC\Files\View->OC\Files\{closure}() #3 /config/www/nextcloud/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php(109): call_user_func(Object(Closure)) #4 [internal function]: Icewind\Streams\CallbackWrapper->stream_close() #5 {main} thrown at /config/www/nextcloud/lib/private/Files/Filesystem.php#806