Tactic 650 transmitter problems.

[Baron]

I have recently started flying again after several years out of the hobby.
My old Tactic 650 worked just fine for the last several months. However, this morning my radio would stick in the "searching" mode when I selected a model. I can not get it out of that searching mode. Took batteries out for 10 min and it still goes into searching mode. Any ideas appreciated. Thanks