Your issue with Zwift and the Garmin Forerunner 245 may be due to connection dropouts, often triggered by alerts on the watch. Users have reported that disabling auto lap and pace alerts can help maintain the connection[1]. Additionally, Bluetooth connectivity issues are common, and keeping your devices close together might help[2]. Some users have found success by using a treadmill speed transmitter app to manually input speed into Zwift[3]. If these solutions don’t work, consider reaching out to Garmin support for further assistance.
Citations:
[1] Forerunner 245m virtual run zwift issues - Forerunner 245 Series - Running/Multisport - Garmin Forums
[2] Bluetooth/ANT+ Connection Issues - Forerunner 245 Series - Running/Multisport - Garmin Forums
[3] Garmin 245/945 support
[4] Garmin Forerunner 245 Music with Zwift
[5] Can I connect my Garmin watch to zwift?
[6] Problème avec le mode "runner"
[7] Running with zwift - incorrect distance - Forerunner 245 Series - Running/Multisport - Garmin Forums
[8] Configuration de la montre Garmin®