Interesting reading on the possible causes of pin hole leaks here:
Copper Pinhole Leaks
Is it just your building? Or does this happen in your area? If it's just your building then the HOA and the builders might be responsible for the repairs.
I redid my other house in PEX about 5 years ago. Redid the copper lines twice and then went to PEX because the house isn't heated in the winter.