Squid Reverse Proxy Issues

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Hey,

I am having the following issues with Squid Reverse Proxy:

My Config Required:

1. www.example.com, port 80, to internal server 192.168.1.7
2. www.example.com/zm, port 80, to internal server 192.168.1.99
3. www.example.com/owncloud, port 80, to internal server 192.168.1.99

I setup Squid Reverse Proxy accordingly and it works great for the first 2-3minutes, then it will start directing e.g. www.example.com/zm, port 80, to the incorrect internal server 192.168.1.7 as if it gets confused what IP address to send the request to. Has anyone else experienced this? Could it possibly be Server resources on the PFsense server that are running low?