IKEv2 VPN hangs after 170Mb filetransfer with Windows 10

I have configured a VPN with IKEv2 on my rb 3011 UiAS-RM.
I can connect with Windows 10 VPN with computercertificates. SSH and remotedesktop to systems behind the router working.
when i try to transfer files (one big or more little files) after ca. 170MB (165MB - 172MB) the connection on windows client hangs. I must reconnect the VPN.
The logs of the router dont show any errors
RouterOS v6.42.1
Windows 10.0.16299.371


/ip ipsec mode-config> /ip ipsec policy print
Flags: T - template, X - disabled, D - dynamic, I - invalid, A - active, * - default
0 T * group=default src-address=::/0 dst-address=::/0 protocol=all proposal=default template=yes

/ip ipsec peer print
Flags: X - disabled, D - dynamic, R - responder
0 R address=0.0.0.0/0 passive=yes auth-method=rsa-signature certificate=Routergelb generate-policy=port-override policy-template-group=default exchange-mode=ike2 mode-config=vpn send-initial-contact=yes hash-algorithm=sha1
enc-algorithm=aes-256,aes-128,3des dh-group=modp2048,modp1536,modp1024 lifetime=1d dpd-interval=disable-dpd

/ip ipsec policy group> /ip ipsec mode-config print
Flags: * - default
0 * name=“request-only”

1 name=“vpn” system-dns=yes static-dns=“” address-pool=vpnpool address-prefix-length=32 split-include=192.168.3.0/24

/ip ipsec proposal print
Flags: X - disabled, * - default
0 * name=“default” auth-algorithms=sha512,sha256,sha1 enc-algorithms=aes-256-cbc,aes-192-cbc,aes-128-cbc,3des lifetime=23h59m59s pfs-group=modp1024

Thanks in advance for any info

Please try setting pfs-group to none under IPsec proposal settings.