Mine does the same thing. I’m just leaving it on. I don’t want to pack it up and be without music while it gets fixed. It’s just too big of an aggravation to get it fixed. I’m in the USA and have to deal with thunderstorms so I just use the power cord to unplug it when I’m forced to.
How old is your 500? My 23+ 555ps did the same thing. But once I tried to push it in a bit more and “sway” the button gently then the switch came back. Maybe just give it a try without plug in the power cord. Hope this helps.
It was quite reasonable (€300 or so) but then again there was only a DAC that was replaced. Transport which is the original VAM1250 was deemed to be fine so not changed. Unit checked over and sent back. It did take a while, about 2 months or so and probably would have been faster if it wasn’t due to the great deal , but happy with the result nonetheless
I had the opposite problem of the switch not latching on, so you power up and then it immediately goes off and eventually you begin to blow fuses trying to get it to latch and no music.
My Dealer just swapped the switch for free - it took about 20 mins. Doing this yourself would need to get the replacement switch type which should be inexpensive and an ability to solder - or access to someone that is experienced with that.
I had the same problem twice. You may actually not need a new replacement switch soldered, although I got one i still have it in the drawer. Sometimes the switch may get stuck and just by taking off and refitting the bracket that holds it will loosen the toggle mechanism. First time I did it together with my dealer, second time by myself.
I had the issue with my 300PS, XPS2 and Hicap2 from 2004
The new switches fitted by the German distributor in 2021 are firmer than the old switches. The symptom was that the switch did not latch when powering on and when powering off sometimes did not deactivate or cut the power.
Phone the naim distributor in your country or in Germany, I’m sure they can help you