objective c - Network connection lost while switching from wifi to 3g -


i have run strange problem, both, reachability , nsurlconnection showing error (no internet connection/network connection lost) after switching wifi 3g. although apps running fine after switching 3g. double check if mobile data on app , device well. reinstalling apps works fine, please help. here reachability code:

-(bool)tochecknetworkstatus { internetreachable = [reachability reachabilityforinternetconnection]; [internetreachable startnotifier];  networkstatus internetstatus = [internetreachable currentreachabilitystatus];  if(internetstatus == notreachable ){     [self displaytoastwithmessage:@"connection lost!" andsubtitle:@"please check network connection." delay:3.2];     return  no; } else{     return yes; } }

code fo nsurlconnection:

    nserror *error;     nsdata *postdata = [nsjsonserialization datawithjsonobject:dictionary                                                        options:0                                                          error:&error];     if (error)         nslog(@"failure serialize json object %@", error);       nsurl *url = [nsurl urlwithstring:palurl];     nsmutableurlrequest* request = [nsmutableurlrequest requestwithurl:url                                                            cachepolicy:nsurlrequestuseprotocolcachepolicy                                                        timeoutinterval:timeoutinterval];      [request sethttpmethod:@"post"];     [request setvalue:@"application/x-www-form-urlencoded" forhttpheaderfield:@"content-type"];     [request setvalue:@"application/json" forhttpheaderfield:@"accept"];      [request sethttpbody:postdata];     [nsurlconnection sendasynchronousrequest:request                                        queue:[nsoperationqueue mainqueue]                            completionhandler:      ^(nsurlresponse *response, nsdata *data, nserror *connectionerror)      {          if (data)          {              nsmutabledictionary *responsedict = [nsjsonserialization jsonobjectwithdata:data options:0 error:nil];              nslog(@"uploaded location response = %@",responsedict);          }          else          {              nslog(@"connectionerror===%@",connectionerror);          }      }];


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