My LS keeps freezing up when I try to calculate points in COGO. I go to Basic and then Direct and it freezes up (Inverse and traverse have no problems). I have to hold the power button down to do a hard restart. All other functions seem to work fine. It has had a problem with freezing up with the last few updates I have used. I am currently using J-Field 126.96.36.199. S/N 429. Any ideas?