Unable to proceed in the solo instance of The Interdimensional Rift

[silvertea]

Every time I try to do the solo duty for Omega raid I disconnect once I get on the elevator.
Sometimes the elevator goes up and nothing happens and I'm stuck till the game kicks me,other times the screen goes black then comes back with the npcs walking forward but I get a DC symbol and nothing happens after this point and I have to wait a few mins for the game to kick me.

I've tried dozens of times but can not progress.

same problem T_T