How do I fix a “max_input_vars” error that is corrupting my menu saves?

Menu corruption happens when long navigation menus require submitting more tracking variables than your system defaults accept, forcing server code to truncate data during saves.

“This is almost always your menu simply outgrowing your server’s default variable limit. I’ll raise the limit and confirm your menu saves cleanly within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions