I think I have figured out what my problem with Google Reader is. The last couple of days the post numbers were much closer to my usual 120-180 posts a day.
The problem is that it took at least two sessions to pile up these numbers, one in the morning and one in the evening. For the previous three days, however, only 100 to 108 posts were were in the reader when I opened it for a single reading session each evening.
It appears that Google Reader is dropping posts shortly after the number of posts reaches the 100 mark. I cannot just split up my reading, since during the workweek I have no time to do any reading before I leave for work. I’ll check again Monday to see whether the evening number is still near the 100 mark.
I checked my settings to see whether there was any limit on the number of unread posts, but I cannot find anything that seems to be relevant to my problem.
There may also be a backlog problem; see Amy Coffin’s comment to the post below.
Has anyone had a problem like this with Google Reader?