Drop in impressions
There was a drastic drop in impressions in the account and the changes in Change History shows that Ad Group Max CPCs were decreased by Auto bidder. Is there any other reason as to why the impressions would drop drastically.
Impression share on Search has increased.
Any other things need to check here.
Re: Drop in impressions
Welcome to the forum,
Few suggestions from my end:
1. Shift from "Automatic Bidding" to "Manual Bidding".Increase your Max CPC bid & try to improve your "Quality Score".
2. Kindly check if your daily budget is enough to grab all the impression for a day. Check "Search Impr. share", "Search Lost IS (rank)", "Search Lost IS (budget)" matrics.
Join me on Google+