Steam Blocks You From Activating After Too Many Attempts?

Yep, I had it the other night. Unsure exactly how long it lasts for but it isn't too long. Someone else told me it lasts around 30 minutes but I wasn't timing it.

Trying used keys also triggers this eventually...

Yes it does, it did before, some ppl said it stopped but it does it again.

I never ran into this on my primary steam account (which I use constantly and have many games on). However, I was checking groupees keys the other day on my alternate account (very few games, hardly use) to make sure they were used, It blocked my after a few attempts.

What's really annoying me about this is it also classes trying to activate a game you already have as an "Unsuccessful Attempt" so when trying to add a bundle of games, if I already have a few, triggers this and I can't continue. Bit stupid.

It always happened, kind of...but now Steam clearly says it

Problem is that it happens with activating a lot of valid keys as well, not only used/duplicate/invalid. I got this message about 7 times in two days and I have no idea why I got it so many times, unless there is a limit on activations in general. Also the time you get locked seems to be a bit random. First time the message stopped showing up after 10 mins, while another time it took about an hour.