if the butternut has gone as well, it probably is that virus propagated
by the beetles. the wilt and the borers show different symptoms. The
wilt, as the name implies, starts with the leaves noticeably wilting.
The borers will show an extended rotting of the vine, with frass on the
ground nearby.The fact that you had only a first good year means that
the first year they were unable to find your squash, or were able to
find it late. Relocation to hundreds of feet away from current location
will give you one good year. frc is indeed your best bet, but make the
support stronger (may I suggest the clamps from Territorial Seeds, on
PVC tubing). You could also consider some insecticide, though someone
else will have to specify which.