Hello!
Try to see if this parameters will help.
Edit the hub.cfg and find the <hub> section. In that section, adjust the following keys (most should exist already, but if any do not, you may add them.)
postroute_interval = 120
postroute_reply_timeout = 180
postroute_passive_timeout = 300
hub_request_timeout = 120
tunnel_hang_timeout = 300
tunnel_hang_retries = 3
On systems with very low latency and fast response between hubs, it may be beneficial to decrease tunnel_hang_timeout to 120, or even 60.