This is not ISP related, it's all PS3. Wether or not it's PSN or the PS3 itself not connecting correctly, I don't know, although PSN seems to be only needed when starting the log-in client, after that I got booted out of PSN and was still playing without dc (pre-patch). But it's definetly not ISP. And it's also not wifi related since the wifi issue on PS3 is already well known and just by direct wiring it resolves. My boyfriend plays on wifi PC (we live together), we rebooted everything and even re-customized the wired PS3 to the internet, and the problem persists.
If you look closely, all these reports are from PS3 users and just after 2.38.
So nope, not ISP. Anyhow if we could have an answer from SE and who actually knows what's going on, thank you.