well I left pooley bridge this morning,all seemed normal with the GTR,then the RED WARNING LIGHT came on for about 5 second's with a message on the display NO TRANSPONDER.i thought i'd lost it,i pulled over after it appearing about 6 time's to find the TRANSPONDER in my shirt pocket with my mobile phone in my jacket pocket in front of the TRANSPONDER,i moved the phone to another pocket & the red light/message never appeared again.word of warning don't place your mobile phone near the transponder.
Out of interest, what phone was it?
I've never experienced that with the iPhone.
Nor me iPhone
a samsung galaxy s4,it seem's strange it never happened again after moving the phone elsewhere !!!!!!!