Forgetting not reliable when replying to Sandy

I like to review my daily digest a couple of times a day, updating it each time, by hitting reply and then issuing a command which I send back to Sandy. Most frequently my command is along the lines of, say: f #4 6 9, where these numbers refer to numbered items in the daily digest. I find, though, that Sandy isn't reliable about updating -- sometimes the items are forgotten and sometimes they aren't. I often have to "forget" the item multiple times before it takes.