Instinct 2 Solar 14.12 GPS loss signal during activities

I am using Beidou for GPS tracking(Chinese ver.), since the latest auto update to 14.12, the GPS loses signal frequently during activities, speed will drop to 0 and then every minute or two the tracking will revive. The recorded activities were like below, this has been for like 2 or 3 weeks. I hope Garmin finds out what happened and fixes the Beidou tracking issues.

PS: applies to walking and cycling activities, maybe other as well, I checked the setting it is using Beidou instead of UtraTrac