Updated to 12.70, but FR 970 still occasionally misses lengths during a pool swim. Today, it counted a 900m interval as 875m. I never had this issue with my 945 or 955. The 970 misses at least one length during every swim workout. I push off the wall fine and glide. I do open turns rather than flip turns and it seems to occur if I get to the wall without any glide into the wall, but I can't be sure that's the common denominator.