I have my doubts, but I'm wondering if there's a weird and mysterious bug that causes client disconnect.

1) The disconnect only happens when typing text into a channel window, like normal, hitting enter.

2) Will not disconnect for text sent via scripts, timer, etc. Only text sent by the user hitting enter key.

It is so rare, difficult to reproduce, but consistent in this regard that it seems hard to dismiss.

Maybe take a glance around the code for stuff that happens during editbox input, when $idle is reset to 0, that might cause a TCP failure where scripted timer messages do not?

What's the quit reason people see when it happens to you?

This hasn't happened recently, but I remember cases where my connection has died (mIRC hasn't timed out yet), I've tried to sent a message and mIRC has disconnected me instantly. Some kind of a TTL check thing.

No idea how messages sent by scripts were handled, though.

It's typically Read Error, or Swift IRC says Input/output error. Maybe Connection Reset by Peer, I haven't been keeping close track. But suffice it to say, it's the only times I am ever disconnected strangely. And I'll have other scripts slinging messages in the background, but those don't cause me to become disconnected.

I believe it's just your connection being bad.
mIRC has an option (alt + o > connect > option) to check for timeout, are you using it?

Yes, I have that option enabled. And as i said before, channel activity still persists. This is not your father's stale connection of the dialup days where people stop talking for a half hour and then you say something and boom. It happens while a channel is happily busy and bustling away, and you decide to jump into the fray after an hour of lurking. boom.

Where did you say that the channel activity still persist?
Yet 2004 called, he says he wants its connection back


In all seriousness:

sounds like an issue with your scripts. Try a clean install?

My suggestion would be to open a debug window with:

and then you can see the communications just before the disconnect happened - which might help us work out what is happening.