since monday we see changing serps at 9 AM ( very bad serps , -90% traffic in this time) switching back at about 10.30 AM ( pretty good serps )
Switch back to bad serps at about 12 AM and back at 13.30 AM. It seems to go the whole day like this.
Overall traffic is up, of course traffic with throtteling.
If this is panda then it is very unusually.