Why am I being told "You're doing that too much..."?

Karma is stored (internally) on a per-subreddit basis; if you are new to a subreddit, you'll have to be patient. The delay will decrease as your karma in that subreddit increases and it only takes a fairly small amount of positive karma before the timer will turn off. This applies to both posts and comments. You can also get the timer turned back on if you make a lot of negatively voted posts/comments.

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