Android TCP Server limitation

I need to maintain TCP Server in my Android app.

• In my application I had connected 12 clients.
• All clients are in active.
• After some period of time, one or more clients are getting connection time out.

I need to know, how many clients can be connect with my TCP server without connection time out.

Note: My Device has a 2GB RAM.Is the number of clients is various depends upon the RAM Limit ?