Connections dropping with Multi-WAN set-up

Hi All,

I've configured a multi-wan setup using the below guide:

https://help.ubnt.com/hc/en-us/articles/205145990-EdgeMAX-Dual-WAN-Load-Balance-Feature

I've put sticky on both destination and source ports but connections to the internet seem to be breaking. For example when connected to a remote host over SSH or downloading a 1GB file over HTTP (breaks after a minute or so). How can I make sure the load balancing feature doesn't break open connections?

Thanks,

/a bit of an urgent situation here.