I was flying the LOC BC RWY 31 approach in Brownsville, Texas last
week when I lost contact with Valley Approach as I was being vectored
to the IAF - CALIA intersection, which is in Mexico. Not a big deal,
since I had a backup frequency from the previous frequency change - I
swirched to it, got Approach, and completed the approach. If that
didn't work I planned on contacting Brownsville tower as I flew
inbound. Still, it was a bumpy approach about 100 feet above minimums,
and I had enough going on without playing with frequency changes.
Reinforced to me how important currency is - if I was not reasonably
current in IFR skills it might have been much more challenging. Also,
I had images of Border Patrol or DEA thinking I was doing something
unsavory...

Michael