WAN LLB and citrix xendesktop

before implementing a fortigate 80E firewall we had no issues

now users are disconnected randomly between 2-30 minutes

this firewall is only used to provide dual wan links

all data is passed to a secondary fw which has the NAT rule for citrix access

the static ip for citrix is on wan 2,

users can connect just fine but it cuts the connection randomly

everything is fine except for the random disconnects

how do I create a policy that forces any incoming connection to my citrix to not get disconnected

I have looked everywhere and can't find any info on this issue

the 80E is running 5.6.3