Nokia :: E72 Internet Connection Error In Windows7?

After establishing connection to PC running on Windows 7 via micro usb cable, there is a problem with keeping internet connection alive.The connection should work because the icon on the phones display shows that the phone is connected to the internet, but the connection seems to be lost somewhere between mobile device and PC (not mobile device and mobile network) although the phone is fully capable to transfer other data via cable between computer and phone, this is the same when connection is created via PC Suite or Ovi suite, or manually established connection using the mobile as a modem.The internet access is possible only after every new connections which works always randomly f.e. it fails/stops transferring data from/to internet after few seconds/minutes or transferred amount of data, it is always different.Windows diagnoses this problem as a problem with DNS server.SW version 022.007 RM-530, E72-1 Custom version 022.007.C00.001