Hi last week, i went from 170 000 impressions per day to 2000 impressions per day with the same CPC and keywords. Just as i wanted to expand my campaign, i got in touch with an adwords professional on here, spoke to him on msn, trying to get some even cheaper keywords. The next day, i woke up, hardly any impressions, maximum i can get a day now is 2000. Same keywords and PPC price. I just don't understand it.
Not enough info to give an answer - has your Quality Score, CTR, or position changed on your original phrases?
Might be a slap...try creating a new campaign with the same keywords/bids/ad groups and see if things pick up again