My dataview trace had some good spikes this morning:
(Along with breaks - not my Internet, BTW).
I decided to look at the data recorded on the device itself:
No trace of any spikes … So it looks like the DataView system is capable of generating some of these.
Although, I have, in the past, been able to find most of the spikes displayed in the locally recorded data.
I am just going to put this down to the work on fixing the recent problems.