I am new for the battle net and just installed. But the game was dropped off very often.
If you’re talking about frequent “Connection has been interrupted.” instances, then it’s likely connection issues somewhere between your computer and Blizzards servers. Packet loss is by far the biggest culprit. Diablo 2 has always been sensitive to any amount of packet loss.
Playing the game with wireless internet providers like cellular based or satellite based (Starlink) connections is not recommended due to their lossy nature. Also using home WIFI can cause problems if there happens to be a lot of radio noise on the band you’re using and/or you don’t have a strong signal to the router. Landline internet (fiber, cable, DSL) and local ethernet are the ideal connection types for playing Diablo 2 on Battle.net.