Not sure if you've seen the posts a few pages back, but quite a number of people with poor international the last two weeks. Just FYI.
Edit: Afriman, I just remembered something. I think I started noticing the issues the same day I saw a post by Afrihost stating that 'changes to the Cape Town IPC had been made and Cape Town users should start seeing better results' or something along those lines. Perhaps I'm wrong, but I'm pretty sure it was the exact same day. I'm in JHB.
Changes to the Cape Town IPC would have been just that, limited to the Cape Town network, and would have no effect whatsoever on JHB or DBN. I highly doubt that there is any link, and if it was on the same day it is most likely a coincidence.