During their first combat deployment in Thailand 1968 three 111's were "mysteriously lost". This was before my time but my contacts in the pilot community were very suspicious that it was TFR related.
Later investigation indicated that the leading suspect was malfunctioning horizontal stab actuators. Bad to have one stick in kharst country.
It's performance after correcting that was stellar.
I agree it was TFR related. I heard it happened like this. The Viets on the Ho Chi Minh trail shot everything but the last coconut up 500 feet into the path of an oncoming F-111 to confuse the TFR. The F-111 TFR system reacted to the blitz of bicycles, trash, and coconuts (?) by pulling up (horizontal stabilizers fully engaged) and stalling out.
I heard there were two instances of this, but am unsure if three planes were lost. I think the ruskies got one and we recovered the other. The problem got fixed and we did not lose another as far as I know.