Who shuffles the threads?
There seems to be no rhyme nor reason for the ordering of threads any more. They're not ordered either by time-and-date of most recent post, nor by time-and-date of first post, nor alphabetically by subject, nor by any other moderately easily discernable order.
I can only assume somebody (or something) is shuffling them at random.
Who (or what) is doing it?
Please can they stop doing it, and put the threads into some sensible order instead?