In those situations, more often that not, the reason ”Unable to communicate (contact moderator)” is used for that very reason.
Whether or not your Internet is to blame, you are in a crowded airspace. We can provide room for NORDO in direct proportion to the amount of room we have to play with. If the airspace is extremely crowded, the time trends toward the lower end of the spectrum.
But the entire reason it says unable to communicate is so that we know going into the appeal that you seemed to have connection issues and it’s typically easily reversed.
On a side note, even though you don’t want to hear it, it’s true. What you’re asking is to be able to fly at will in a crowded airspace without the ability to communicate or a connection that flickers in and out. That simply isn’t going to work, so, at the time of the report, if your inability to communicate is causing issues, then you have to be extricated from the airspace. (The only other option would be to eliminate everyone else and leave you alone in the airspace, but that’s seems less-than-viable as an option.)
Then it’s easily taken care of after the fact.
The initial ask of ATC just letting you barrel around the airspace NORDO when there are 100 other planes, not likely to happen.