Last monday we started having issues regarding packet loss when opening multiple websites.
A simple representation of our network is ISP=>WAN(modem)=>Juniper=>Switch1=>Multiple switches => Clients.
We were able to narrow down the problem by connecting directly onto the modem and forcing web traffic, this resulted into 0 issues.
After that we shut down the connection from Juniper to Switch 1 and connected the pc directly to the juniper, this resulted into extreme packet loss (internet connection nearly completely dropping).
Were not sure what causes it, however we do know how to force it. This is simply done by opening multiple websites (3+). We do know this causes the Juniper (SSG5) to drop the connection to bare minimum.
We had no issues previously, no connections have been changed, no config has been changed in the last 6 months either.