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I am using Stack Overflow. I just logged in and am trying to post a question by clicking the "Post Your Question" button, but it gives a pop-up saying "You can only post once every 90 minutes."
I didn't even post anything today. Why is this happening? This similar thing happened to me previously also.

marked as duplicate by rene, Fish Below the Ice, gnat, Monica Cellio, Patrick Hofman Jul 15 '15 at 17:51

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I guess someone within your organisation or school using a low-reputation account posted today. There is a threshold to prevent mass-asking of low-quality questions, and you hit the threshold.

This is not a bug: it is by design. Since some users share the same IP address, there is a filter not only on user name, but also on IP address.

So unfortunately you have to wait until the time is over, and then try to post again.

Also see The Complete Rate-Limiting Guide on this (see under Asking).

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