Am having a problem with my well-out-of-warranty Radias...
Switch on, play any sound - brilliant (as usual

However, if I leave it alone whilst playing another keyboard fro 5 mins or so and start playing again, the pitch has gone mad - suddenly it's like there's two timbres, one in pitch and the other gliding all over the place until it eventually gets to the correct pitch - but the gliding 'sound' is nothing like the patch being played... it's really harsh and painful!
Switch it off again and all fine until 5 mins later...
Happens with all sounds irrespective of timbres or oscillators or filters or Fx that are used in the patch.
Anyone else had this issue? Is my Rad destined for the Korg workshop?