I’m experiencing the same issue. Got AGL internet connected a few days ago.
Every day from 6PM to 11PM, the speed is horribly unstable. Drop-outs, extremely slow upload speed, webpages can’t load etc.
Took speed tests every day, the following speeds were what I bought for?
I’ve checked the forum here, lots of people having the same issue. This is definitely AGL network issue. AGL is not resolving the issue still, people resolved the issue by changing ISP. After changing ISP, no more such issues.