I have a recent, similar problem. I have two or three Moto Type II TRS programmed with TGIDs and Alpha lables, and last week I realized that on one of the systems, the Fn+5 is not causing the toggle (it works on the other systems). Its almost like there is some other higher priority setting that has it Locked in TGID mode. Any ideas? I did a quick check of owners manual with no luck.