I saw that isn't a new question and this bug is still don't fixed. Please garmin do something with spo2 widget. I don't know it is only 245 problem, but it works only for a while after reboot. After some measures (sometimes one) it starts to freeze in about half of a measure till you reboot again. I'm pretty sure it is software problem not my dirty wrist. I have latest software 8.20. If someone from garmin read this, please look at this issue.