I can second that there is no solution from support. The response from
them was: This is a newly reported issue, and affects FortiClient
versions 6.0.3 to 6.2.6. The issue seems to only affect users on IPSec
VPN tunnels, SSL VPN connections have no i...
My company is having the exact same issues. We are using Forticlient
6.2.6. I have logged a support case with Fortinet. I will post if a
solution is found.