Hello guys, as we know, P & G is a bit sensitive and you need to keep it well.
First remove the additional tracks, just keep the one you should use, avoid saving unnecessary replay every time you close the game.
Need to check the various folders in dir \ GTR2 sure not to have double and keep defragmented the HD.
Make sure you have a PC efficiently, which is not too hot, clean dust that clogs the fans and radiators.
However council periodic disassembly, 7 \ 8 months, replace the conductive paste on the processor and make sure that the power supply can give instability.
I know that everyone knows, but I remember that before you start the game you must make sure not to have unnecessary background processes, turn off all program updates, antivirus, etc. ...
As a final resort, you can format the drive and reinstall the OS, and then GTR2, upgrade to ver 1.1, lobby patch, P & G_3, P & G_3.1
As for the internet connection, try to make some connection test ping and found that there are too many interruptions and latencies of data.
If there are malfunctions check all cables and plugs are in place eventually using a spray flux, and if this is not enough, contact your provider
Ciaoo