Warcraft 3 Hamachi crashes ingame sometimes

recently I started to play warcraft 3 (version: 1.26.0.6401, tft, the original) again. Since playing alone is pretty boring I made a Hamachi server and connected with my friends. Now we have the problem, that most of the times the game crashes for some people (not always the same player). So its pretty unplayable right now. What I don´t understand, that I played with one friend for ~90 minute on one map and it didnt crashed. Sometime it crashed after a minute sometimes after 40 minutes.

Anyone knows how to fix this? If more information is needed I can add it. Kinda strange problem but maybe someone ran through it.

The problem was that the connection to the internet was through 2 routers which seemed to have produced some errors