Does Google Adsense give warnings?

They will Warn you if they THINK that what you are doing is genuinely out of mistake or ignorance or user driven (porn links via unmoderated comment)

But things like what you are saying suggests or at least gives an impression that you are doing it to cause accidental clicks deliberately. For that they usually give no warnings.

Warnings are mostly for content. I have had a warning, and I was given 3 weeks.
Then again, you never know..

Can't say it any better.