I was having crashing problems but since the 4.10 update it's been very stable with My Watch.
Do you run it with the gps info updated, i.e. do you have the sunrise/sunset times showing at the top? A lot of people, including myself, have found that it crashes when you update the gps info, but runs ok without it.
Yes...GPS updated and sunrise sunset showing. The only things I have turned off are temperature and week number.
I tried deleting and reloading a couple more times and it finally worked. The heart rate graph is back now, but the sunrise/sunset data just says "Sun Data Need GPS Usage" even after I've logged a several workouts using GPS. I've also noticed that after getting email notifications, it seems to get stuck showing one email even after I've acknowledged them all. If I turn the watch off and on, sometimes the email notification will reset, but as soon as one comes in, the notification icon stays on even after I've checked all emails.
Everything seems to working with this watch face running the new beta. I've been using it since last night with everything enabled and no crashes so far, knock on wood.