about every 6-7 months my 250-D will have problems returning to the control channel. im using control channel only trunking for CSP. and it keeps hanging up on 866.750 , control ch. 868.5625 (in the hartford area) now about a year ago , it was hanging on a different freq. so i tried programming all the freqs for the hartford area last year , and it didnt make a difference, i still got one freq. hanging after transmissions , and it not returning to the control channel. or moving on to the next freq. does anyone know what causes this (other than the 250-D and 785-D are junk) and what if anything can be done to correct this ? thanks.