Why do people during a nice and fluent chat simply stop and not respond, or simply log out?

I consider its a lack in education and respect and politeness.Or am I the only one in the world feeling this way?
Or is it normal part of culture in the US, as I know 90 % of people in SW are American ?

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KamiKazi · M

I've been told that I appear to go offline regularly even though I am definitely still here. I mostly use SW from my phone so I assume it is showing me logged out when I switch to another app? Maybe the same is happening for others. I also am on here at work and sometimes have to abruptly stop responding because I get a call or need to be in a meeting or such, but I always come back as soon as I am able and pick up where the conversation left off.