As i said earlier about my iphone touchscreen problem the problem even persists?

As once it feel into water 3 months back but i got it repaired recently a 10 days ago, after repair it worked perfectly fine till a week after that its started a problems like touch not responding, time & date not working but after few mins it used get reset by itself (or) i used reset it then everything gets to normal but now its not at responding i even tried these teniques like reset, itunes, charging but nothing is working, now what can be done as my iphone is very important for me please suggest somthing?

There maybe some hardware problems in it! Give it back for repairing, because there's nothing you could do to fix it!