I've the problem, that my flows stop running because the connection has expired. (As far as I know: after 90 days).
Unfortunately, I got this information a week later - as a summary of all my failed flows.
So in fact, my flows weren't running for almost a week! This was not the first time, so I assume, that this will happen also in the future.
Also very bad: if I'm out of office for a longer period.
Links:
"You can update a connection that isn't working because your account details or your password changed"
Update a connection (microsoft.com)
Thanks,
Max