Common in the Tropics but you even find them getting into a newbuild Feadship built in Holland
if wood is not pretreated before construction.
The first step is to see if you can find a match based on the borings (residue) left behind.
There are many types of wood borer insects
so you should type that into google
and you will get lots of info on the various types like this:
Failing that ask a fumigator to take a look at it and quote as it will only get worse.
methol Bromide was the cure all before but it is banned in the US now
The really nasty products should be profesionaly applied