“Semiotics is in principle the discipline studying everything which can be used in order to lie. If something cannot be used to tell a lie, conversely it cannot be used to tell the truth: it cannot in fact be used “to tell” at all.” – Umberto Eco, Italian philosopher, b. 1932
“Least said, soonest mended.” – A bad event or situation can be forgotten more easily if you don’t talk about it.
*Another interpretation: If you don’t say too much, or even say nothing at all, you won’t have problems afterwards.
Drop off the radar = fall into obscurity, disappear
The band was very popular in the late ’70s but after that they just dropped off the radar.