Yes but even E.T would have an Off switch on the tractor locator or Nav system`s ! Hard to say why they crash ,but we seem to of crashed a few probes ourselfs !
I already said that radar doesn't cause crashes, but that these signals might actually have attracted UFOs. They were certainly detected at very high altitudes. I know some misinformed people keep saying that they have never been detected in space, but in fact they were as early as 1947, when we had nothing at all up at that altitude.