645M Freeze after FW 6.20

My Garmin freezes after every activity when i press save. Then i have to restart the watch. After the restart there is mostly just 10% of the battery left, even though i had more than 80% before. This is already my second 645 as i send the old one back bc of issues with the gps! This problem is still here, it always takes longer than 2 minutes to load the gps! Compared to my old 920xt where it took about 5 seconds!!! Really not happy with that watch..

For your GPS sync time issue, on their own the watches almost always take 2-3 minutes to sync to GPS. To get better, within seconds, they need to download an "ephemera" file to give them a head-start on syncing. They get this when they are connected to the computer, or connected to WiFi. (I do not believe they get it when connected to your phone via bluetooth, but I may be wrong.) So if you do not have a wifi network configured on your watch, and also do not regularly sync with your PC, this could explain slow GPS sync.

(I am not an expert and if you already knew that, apologies. Just a suggestion.)

Tried this and for some reason it will not let me write the file to my watch.  

I only have freezes after saving for longer workouts (> 2h). The watch freezes 2 seconds after returning to the watch face. No 3rd party apps besides spotify.

I've never had a freeze for shorter workouts. 

Garmin, this sucks - i reported that damn bugs weeks ago and all i got is kinda „we know the problems from a few customers“ - come on, People are paying big Money for a solid Hardware and a really bad software. At least TRY to fix it !

I got the same in my brand new 645. HELP! It really sucks!

If screaming into the void makes you feel better, then fine but if you want help here, tell people what setup you've got. Not everybody is getting this problem so it will help Garmin and other users if you tell them what CIQ apps you have, what devices connected, wifi sync, whether this is for long or short runs or anything else you think is relevant. 

While we wait for a proper fix (and we may wait a long time especially as Apple have broken the Connect app for iPhone users) there are lots of partial fixes/workarounds that may help. Read the suggestions below and tell people if they worked for you. 

E.g. I found deleting the FIT files worked for me and I've only had once freeze in the last 2 months, despite using the device almost every day but usually less than 90 minutes. Other people are getting the problem every time but unless it's a hardware fault on their particular devices the only explanation I can think of is that it must be due to individual setups or types of activities/data. 

Former Member can you at least give us an update on the status of this issue? This is been going on for months! Is this going to be addressed or is Garmin throwing in the towel on the 645?

Many of us actually called Garmin to report this on top of posting here. What me and others are mostly complaining about is the lack of communication on this issue. Given the wide number of reports on this I can't honestly believe that Garmin is unable to reproduce and debug the issue in their lab. Yes it is mostly random, ranging from every activity to once in a while, but I'm sure they have the resources to test this in a controlled environment.