Hi Neil,
I had a strange experience with one of mine recently - like yours, still on an electronic timer.
I noticed that the station hadn't restarted one morning and on investigation up in the loft found that the power supply had failed (electronic caps blown in the output stage, so pretty terminal). Swapped in a 'spare' PSU which happened to be constructed 'the opposite way up' - i.e. it had the transformer body and cable exit 'above' the 3 pin plug rather than below it. Checked the timer settings, plugged the new PSU in and powered it up, - all fine, station back online.
Next morning - no station showing again.
Removed the PSU from the timer and tested it downstairs in a different socket - all OK, so replaced it in the timer - but unit failed to power back up. Was on the brink of changing the RPi, when something told me to re-check the timer - and found that it was indicating 'RND'
. Then noticed that the timer has an 'RND' (Randomiser) button located just under where the 'top' corner of the new PSU sits - and had obviously been pressed as I plugged in the new PSU, and had set up random timer operation, but of course I couldn't see the timer screen because it was hidden behind the PSU... Duh!
Reset the 'RND' button back to normal and the problem went away. Probably not a'go to' fault, but one to be aware of if running the station on a timer. (I have since changed to another 'down-hanging' PSU to keep the body well away from the timer buttons/screen - 'just in case'.
Best Regards
Peter