Hangs in static library(.a)

Hi,

We are compiling and creating a static library(.a).
We have an application(compiling as different project) linked to this static library.

We have a part of code(include tcp socket read) in static library, which works fine initially. But hangs afterwords.
If the same code is kept in application, it works fine without hang.

We tried increasing heap and stack memory of static library.Result is same.

Please suggest.

Regards