Yes I have also noticed my links don't work sometimes. They don't redirect from the hoplink, it just hangs or says "server not found". This only happens sometimes. I might wait a few seconds and try again, then it works. It's very random but surely having an impact on sales.
Now, Even after refreshing the page nothing shows up!!! Have asked several people to check the links but everybody gets a blank page.
I am wondering what is going on... I have not made a single sale this month... I made a purchase using my own aff link and verified that the hop link is working... I really do not understand this..