Buggy update on FR255 (13.21)

Have you done a long powered own restart of the watch (holding the top left button until the watch powers down) since the install. Sometimes that helps.

Also when I had disconnect issues a while back I:

1. Forget device connection on bluetooth on phone

2. Uninstall GC app

3. Restart watch and Phone

4. Reinstall GC app

5. Pair device again

It is clearly specifically related to the new update, no issues prior

Yes but sometimes doing these things somehow resets something and it sorts the problems.  

Since the update not able to edit from phone. Been switch off watch and phone too. Other things also not fix 

If you restarting does not help, mods will contact you to file a bug report if you specifically list the steps that triggers the bug.

i've done this, but also unable to edit run activities from phone

Seems to be an problem witch your phone. Have you set the autostart right to GC? Have nothing to do with F/W update.

there's a thread with the same problem. 
forums.garmin.com/.../watch-disconnects-bt-while-starting-activities
and in the beta discussions those bugs are also known.

has nothing to do with a phone, I have these bugs on two different 255 watches only after installing latest update