Lua Packet Loss on TextMessages sent on onLogin event

[G4BB3R]

Hello.

Sometimes the onLogin messages do not appear on my server (10% of the times nothing arrive):

23:40 Welcome to **********.
23:40 Your last visit was on Wed Feb 06 23:33:47 2013.
23:40 #x#[...] parameters [...]

My server is 8.6, and I really can't understand why is occuring packet loss on onLogin events .-.
I really need the messages to be shown because they have some parameters that the client will parse.

Thanks