is anyone else having problems with there garmins ?? I was on hols over the weekend but the lads took the hounds out for a run , we use the 320 receiver and 4 dc40,s and 4 t5,s , everything was ok round the truck at the start of the day but as soon as hounds moved off everything went to pieces , ended up losing hounds for four hours , lad aint used the receiver much but he knows how to calibrate the compass ect ,, any ideas lads ?