Google bug affected rankings.
On April the 5th many business owners noticed a drop in Google page rank, Google later confirmed that it was causing some sites to be deindexed even.
On April the 7th, @searchliason posted that they were aware that some sites were impacted beginning on the Friday.
Today the following tweet
The indexing issue has now been fully resolved. We apologize for the inconvenience. We appreciate your patience as we restored normal operation.
Times like this leave room for thought, the expression "Don't put all your eggs in one basket" comes to mind and the fact that we may all be becoming a little bit obsessed with our SERPs.
The great news is that things are now back to normal and the panic is over for business owners for now. If you have noticed a drop in your serps recently contact us so we can see if there is anything we can do to help.