I have two sites where the data in GWT has done this
Notice the huge drop-offs in data - but when I look at any other analytics tools such as GA or the stats in Wordpress, everything is fine.
The first site has a massive dip in impressions and clicks, but position and CTR have recovered a little, but are still off.
The second site has just disappeared completely.
- Is Google just having a bad day/week/month?
- Should I expect this to just recover on its own?
- Should I contact Google?