Crash when saving walk or hike activities.

Hi. Don't know if this is related to upgrade to last 2.50 because I never have had the opportunity to save a walk or hike activity, but during my last holiday in the alps I made some trekking of about 5 8 hours each and when I eventually tried to save the activity the watch always crashed and restarted and the only way to save the activity, I mean kind of fix, was to change sport before saving, example, from hike to walk or the other way round. I'm sure this is some sort of bug with this firmware or even previous ones. Anyone? 

Thx

Andrea