There seems to be a glitch, bug, or error in the game. While i'm playing, solo, it makes me leave the group randomly. Maybe it is because I am by myself for too long or something. I am not pressing any button that would make me leave, unless there is one I don't know about. So it anyone knows why this is happening, please post if you know how to fix it.

You can actually post this directly in the Ladder Slasher forum or even Site Suggestions

I think the cause of that is generally when you don't attack a monster for several (i think it's 4) rounds, however it's hitting you. It'll make you "rejoin a group".
On HC, this is a rather nice protection mechanism.

That's true but I am attacking the whole time, mostly because I am by myself. So I don't think that is the case.

Laggy at all?

I don't know, it's possible that there's a glitch.

Feel free to make a site suggestion in the places that Kampy posted above.

No it is not laggy. Probably is a glitch.

Thanks for the help.

It isn't a glitch. If you are inactive during combat it removes you from the group.

I am not inactive though. I am fighting the whole time.

I'd be curious to know what you ping to the LS server, if you lag and it doesn't detect action it removes you as a safety feature. If this ONLY happens during combat, then I would take a very strong guess you are not sending packets (or actions) to the server, and the server is removing you as a precaution.