Disconnections. Auto-translated

During the game, a message appears: “Player X has disconnected – you have won.” This can happen on the first day or after a week (maximum of 10 days of gameplay). I thought it was some kind of bug with ubi.com. I and a friend installed Hamachi, and the same thing happened – on the 8th day, it says “Player disconnected…” We loaded the autosave, and it was the same. At the moment of disconnection, I pinged the internet – there was no packet loss. Internet speed is 12 Mbps. The firewall is disabled, and I also tried disabling the antivirus. System: Windows XP SP2, AMD Phenom 9950, ATI Radeon HD 4800, 2 GB of RAM. I tried reinstalling the game 3 times. I tried playing with many people – the result is the same. My friend, however, plays on Ubi without any issues. In general, if you have any ideas, I would be very grateful… After the disconnection, it says that error 2.22.68 occurred in the ubi.com service 2.