No Download >400 MB possible

I can’t download files/archives bigger than 300 MB - it shows a internal server error. The NC-Web-Log says: App “TypeError: Argument 2 passed to OC\Streamer::__construct() must be of the type integer, float given, called in /var/www/nextcloud/lib/private/legacy/files.php on line 166”

My Router knows NAT Loopback. dnsmasq is “green” with my internal IP- plus the above mentioned dyndns-Adress and 150 as cachsize.

I am not able to sudo or ssh anything bc I still don’t know how to connect to the NCP );
Thanks for any help (-:

NextCloudPi version v0.67.2
NextCloudPi image NextCloudPi_11-04-18
distribution Debian GNU/Linux 9 \n \l
automount yes
USB devices sda
datadir /media/USBdrive/ncdata
data in SD no
data filesystem btrfs
data disk usage 19G/466G
rootfs usage 3.9G/29G
swapfile /var/swap
dbdir /var/lib/mysql
Nextcloud check ok
Nextcloud version
HTTPD service up
PHP service up
MariaDB service up
Redis service up
Postfix service up
internet check ok
port check 80 open
port check 443 open
IP (-: (-:
interface enx001e0630f968
certificates (-: (-:
NAT loopback no
uptime 1day