Thanks for the reply. I know I definatley don't have anything in my house on a timer. It even happened last week whilst I was away for four days. Got nothing plugged into phone line etc.
Yeah latency is high, it was 10 ms higher on the days prior to the graph you have seen. I've had some problems with random disconnections, openreach just swapped my d side onto a new pair. My modem stats say max attainable rate of just over 50 meg but my ip profile is currently sitting at about 38 meg. Since the pairs were swapped the upload has increased (doubled almost) but the upload profile was 20 meg. Seems the download profile hasn't reset it's self.
I had it in my head that I read somewhere that on FTTC your line has to re sync to allow any profile changes, wonder if that's what's happening here or it's another issue causing 12 hourly resyncs. They are not happening to a set schedule, can be an hour either way and sometimes the evening resyncs don't happen at all.
Freeserve Dial-Up --> BTopenworld
-->Talk Talk LLU --> ZeN
DrayTek 2850 VN