tcp retransmissions

Hello I have a problem with my configuration
when I connect to FTP or WWW from internet, I have many tcp retransmission’s and connection is freezing or breaking after while
ping’s is ok

when I connect server to R1 port (without switch) is working great
what I doing wrong ?

my configuration

R1 - CCR1016-12G
eth1 BGP
eth6 - eth7 (bonding mode [active-backup])

R2 - CCR1016-12G
eth1 BGP
eth6 - eth7 (bonding mode [active-backup])

R1 & R2 is connected with iBGP and making VRRP as GW for servers

R1 & R2 is cross conection to SW1 & SW2 CRS226-24G-2S+
with trunk with spf1+ (10G) and eth23 (1G)

servers is connections to all ports
to test I don’t bonding eth card’s