245M crashing when saving an activity

Since last week my 245M is crashing when saving an activity. When pressing "save", the watch is restarting. Then it goes back on the activity saving menu, I press save again, it crashes again. On the 4th or 5th times, it does not crash and the activity is saved but with a training effect of 0/0. It did that on every runs of last week. Yesterday I upgraded to SW 3.10, I've run today and the problem is still here.

Is that a known issue ? Any fix ?