some files where i go to download them say that have an error
Most likely those files have been removed due to DMCA copyright or the file's been removed. You can use the link checker to see if the file exist before downloading them.
can someone confirm if stats are working fine?
I can see a suddenly and big drop since yesterday.
It's a Monday, people usually work or go to school rather than stay home. It's not a surprise to see download drop on a weekday.