This has been happening to me lately too. It's disappointing because I ran gboard & faster voice typing w/o network permission for a few years without an issue until lately. I've had to reinstall it 3 times since Christmas, I'd guess, the latest time being right now.
I'd rather reinstall and set it up again, enabling voice typing, disabling network after the model downloads, and then run it until it stops working again, versus enabling network so it has the opportunity to phone home. It's annoying to have to reinstall, but doesn't take long. I use FUTO keyboard as a backup if I'm in the middle of something.
I like the way gboard drives, but maybe I'll start using FUTO keyboard more overall. It would be nice if there was more open source options.