Hi,
My Pure Evoke 1S ran fine for years. Then two years ago it started cutting out every now and again, and, at other times, just failing to switch on, by constantly recycling between off and on. The higher the volume setting, the quicker it cut out.
I persevered with the radio because a) it was expensive at £90, b) the sound is very good quality, and c) I could not see a reason for the fault other than a component failure (and there was no obvious sign for that).
I then discovered the fix and it is quite simple. With the radio on, select the menu option "Energy Saving Settings" and set the option to "NO". The radio will works as normal, immediately.
Hope this works for you, too.
Bob
December 2017