Very often, this is due to Firewall interference.
If you experience it repeatedly in one location only, chances are there's an interfering firewall along with any given wifi you use at the time. My advice is always to
a) turn wifi off, so you do not have to deal with a potential firewall-obstacle, assuming this is the case of course.
b) if this doesn't work, restart game. this will naturally only solve the problem if it wasn't due to that... Which leads me to say that should a firewall not be the case, then I do not have any advice.
Will be happy to hear from others, as I'm always looking to improve my helpfulness.
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