You can't control if your internet provider decides to start blocking. That is independent from your router and out f your control. Turning off security does not control what the ISP does on their end to block connections. And when they block it will not be everything. Often it is just certain destinations/services.
Your box provider is far from helpful. And from his reply, he really does not seem to care or know much. The RED power button on the IR55 (which comes with the L1) is a programmable button (to be able to control TV Power, soundbar, etc..) . It is NOT designed to do anything on the buzz box by default. The Green button is the actual power button for the Buzz Box. I am not in front of my L1 now, but I am pretty sure there is an option in the menus (Powerkey definition) to have the green button work as standby/suspend, or shutdown. I always use shutdown to ensure a clean boot all the time. The L1 literally takes less than 5 seconds to load, so why bother with Standby.
To program the RED button to mimic the button of another remote, you can follow the instruction for the remote's manual.
PS: Did you try what I sent you yesterday in Direct Message ? Check your messages on the top right of this forum (envelope icon).