Forerunner 955 disconnect after update to 19.18

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I'm sorry to read that! Please follow the steps from Remove and Add a Device From the Garmin Connect App to establish a fresh connection to your phone and Connect app. If the steps do not work, please contact Garmin Product Support to work with a live agent if possible. 

I have had the same issue since updating to 19.18 as well.  I've tried factory resets on the watch, re-installing garmin connect on the phone and when i try to re-pair the watch to the phone, it's a 5% chance that it finds the watch.  Then it pairs for 10 or so minutes then disconnects again.  I've even tried numerous combinations of turing on/off permissions, but same thing.  Then today whenever i connect my watch to garmin connect and sync it, it says im on the latest firmware, but after i disconnect, it tells me i have an update.  Since then, I no longer have the pairing issue but wifi, messaging, and HRM no longer work.  Have you had any better luck?

I have the same problem too! (Forerunner 955 Solar) After the 19.18 update both bluetooth and wifi stopped working. I can't get in touch with my mobile no matter what I do. I uninstalled the Connect app twice with no improvement! Restarting both the watch and mobile does not help either. Really hope that Garmin ASAP sends out an update bug fix!

J’ai le même soucis...
A priori, la dernière mise à jour du firmware 19.18 a été faite, mais ne se serait pas déroulé correctement. J’ai le WHR à 0.00.00, ce qui semble anormal.
Avez-vous réussi à corriger le problème de votre côté ? Seul ou avec l’aide de Garmin ?

I recently encountered a similar issue with my device. Initially, it couldn't connect to my headphones, and shortly after, it failed to connect to my phone as well. I eventually had to send it back to Garmin for a replacement