Unfortunately, I am at work so I can't do much until I'm home. I currently use a Ubiquiti EdgeRouter 4, the port forwarding feature also includes net stats that display how many times the forwarded port gets used. Since the time of the issue it's at 0. All port testing tools I have used online come back at "closed" etc.
@golden_fibre seemed to have luck with change the IP which I must be honest and haven't tried yet, so I will need to try that and see where it lands me.
