Got a problem with a t5 mini collar, collar turned itself off the other day and will not come on now and will not come on and show a red light when charger is attached. I've clean terminals so it's not that. If I hold the power button when charger is attached red light will come on but will not go green after being on for several hours? Anyone had similar? Will be emailing gps4us if I can't get any help from here. Collar is only 2 years old as well so shouldn't really have any issues