2-- Same issue as possibility #1, but all Joey's are affected as well. Maybe the Joey's have linking problems and cant decide which Hopper runs the show in this scenario? This one probably does not have a solution, unless you are on a weird edge-case where you only need H3+'s and no Joey's.
For both of these problems, the solution would be what I suggested earlier: You would need to install a second dish. This would isolate the second Hopper3/+ in that scenario (assuming that combo is also on a separate internet connection) and/or allow for a completely separate third Hopper 3. Either option is technically possible, it is simply a matter of which (if either) Dish would be willing to allow on a single account. Worst-case scenario is that a separate account would be required for the additional Hopper.There's no possible way to connect a third Hopper 3
The most likely reason I can think of is that Dish does not want power users hogging multiple Hopper+'s in a single installation, while other customers are still waiting to get their first (and only) Hopper+. These are new, and still in short supply. Once enough have been manufactured to meet the demand, then maybe the rules can be loosened up a little.3-- It is technically possible to do so no problem, and the business rule is arbitrary. Reasons I can think of...