SSLVPN down - traffic files - v5.2.13

[Alexandre]

I have a fgt620b with v.5.2.13, when traffic copies files through ssl vpn the tunnel drops and gets reconnected. 
If I get only connected in ssp vpn it does not fall. Has anyone ever experienced this?

[Alexandre]

[86:root:5103]SSL state:before/accept initialization (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read client hello A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 write server hello A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 write certificate A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 write key exchange A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 write server done A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 flush data (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read client certificate A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read client key exchange A:system lib(xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read client key exchange A:system lib(xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read client key exchange A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read certificate verify A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 read finished A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 write change cipher spec A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 write finished A (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSLv3 flush data (xxx.xxx.xxx.xxx) [86:root:5103]SSL state:SSL negotiation finished successfully (xxx.xxx.xxx.xxx) [86:root:5103]SSL established: TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 [86:root:5103]req: / [86:root:5103]mza: 0x948b350 /rmt_index.html [86:root:5103]def: 0x948b350 /rmt_index.html [86:root:5103]SSL state:warning close notify (xxx.xxx.xxx.xxx) [86:root:5103]main.c:sslConnGotoNextState:280 error (last state: 1, closeOp: 0) [86:root:5103]Destroy sconn 0x2bc7d600, connSize=8. (root)