I eventually sent mine off for a replacement from Garmin, which has been fine.
I am having the same issues. Had my Vivoactive 3 for 2 years now and pretty much no issues getting the gps connected for my runs until a week and a half ago - finished a a 10k and was walking it out on the cool down then felt the buzz saying it finally connected.....
I"m having same issue with my Forerunner 225. No GPS at all. Injured knee and had 1 yr period no running. Haven't been able to get signal. It just searches forever. Software version is 2.90 but GPS Version is 0.00. GPS will not update on software update.
This has been exactly my experience! It started last week. Not connecting to GPS after 10 to 15 minutes. Honestly I didn't even wait around longer to see if it would ever connect. I got my FR45 beginning of May 2020. I've spoken with support about this twice. The first time they suggested I delete the CPE file in the remoteSW folder. That almost always fixes the problem. But every time I sync it comes back. Today support had me do a hard reset, I said everything back up and synced, and it worked. I thought I would test it out this afternoon before I go on my run tomorrow morning and lo and behold, won't connect to GPS. I'm going bonkers.
So many people with the same problem, I had the same issue with my 230 and checked the about section in system and found GPS to be 0.0. I opened a dialogue with garmin uk and tried all options they gave me when I questioned the possibility of a rogue update somewhere down the line I was offered a refurbished one at no cost As mine was still under warranty albeit not used for a while mine has now been replaced and working fine, I just need to Personally get running again
you can enter the serial number on the garmin website to check its warranty status if you are unsure
I had same trouble with FR225. Boudght it in 2016 and it worked great til I had an injury and stopped running 2 years. When I started back, couldn't get signal. GPS 0.00 version. Garmin said that meant the GPS was not working correctly and I needed a new watch. I asked if I could get the latest GPS update version 3.5 in a file form and I could attempt to upload myself. They said they would look into it. No updates on that question.