Well it's intermittent issues so there's no useful info I can post other than describe the problem.
For the last 3 weekends my line has had a lot of spikes and some days were worse than others. I knew that these were spikes because light traffic equipment and applications were still working. As is the case with all intermittent faults, I've been told that everything is fine now and I've been asked to run tests. Even if I was able to run the tests while the issue was happening (very hard because you can barely load a webpage), they would just show a low throughput figure and a high latency figure.
What prompted me to switch is that today I had a complete outage and so far the problems were only seen during the weekends. I know from experience that intermittent issue take a long time to fix and I don't have any time to deal with some utility company and its patronising support staf. If it is what I believe it is (ISP equipment) then switching will resolve my issue. If it doesn't, then I know that I'll have to invest the time.
I'm looking at AAISP at the moment. It will cost me slightly more but if it fixes my problem then it would be worth it.
5 years ago I might have spent the time tinkering with this but I couldn’t care less anymore about gremlins.