Forerunner 955 is known to have serval bugs in Track Running. See here
This bug is found two months ago and during this period Garmin released 965. I brought 955 for this Track Run and Structured Interval Training. I am disappointed that Garmin could not fix those bug in TWO MONTHS. I am thinking upgraded to 965, but not sure 965 got same problem. Could any 965 owner test it out?