My Forerunner 45 has had issues for 2-3 months now. At first, it would not start runs. I would hit the run button, wait for GPS signal, hit the button again, and the watch would display the normal running screen except the timer would not be moving. The only way I could fix it was to reset the settings or reset the whole watch, but those turned out to be temporary fixes. After doing it a few times, the watch wouldn't start runs no matter what. During the time that resetting the watch was working, it would delete runs before I had a chance to upload them.
What I have found out from looking through posts and contacting support is that my watch's software is out of date (version 2.60). My understanding is that the current version is 3.40, so clearly my automatic updates (which I never turned off) were NOT working in the Garmin Connect app. Support told me to get Garmin Express, but when I plug my watch into the computer (a Microsoft Surface Book 2) it makes the "device connected" sound, waits about 10 seconds, and makes the "device disconnected" sound. When I open Garmin Express, it will not detect my watch.
This means I can't get my watch to update through the computer, so I tried to get the Garmin Connect app to update it, but that is 100% "automatic" and I can't find any way to force an update.
I am not sure what to do, this watch is coming up on being a year old; I got it last summer, probably in July. Hopefully someone has a miracle solution on here or I can figure out how to get a replacement.
It seems like people have a LOT of issues with the Forerunner 45, which sucks because I had the 35 and it worked great for 4+ years (still works, too, I've been using it as my backup). None of the issues seem to be exactly the same, but if they have the same cause I hope Garmin figures it out.