Ring Smart Light Bridge keep disconnecting

I have my Smart Light Bridge and a Floodlight battery version since last summer. Last year it seem working fine. I disconnect both of them in winter since it gets pretty cold here in Canada. I put them up again recently since the weather getting warm. However, my smart light bridge keep disconnecting. It will reconnect for a while then it offline again. I moved the bridge right beside my router. Also used 3 USB power supply including the original one. I even factory reset the bridge and go through the setup process again. Still no luck. The bridge still keep disconnecting. Does any body have any idea? My bridge firmware version is 120300432