One Ikea Fyrtur blind keeps disconnecting after about a day

I have four ikea blinds paired with repeaters and the smarthings hub v2. One of the four disconnects after about a day or two, happened numberous times now; checked the blinds have the same firmware. Looking for any ideas on why one of them would disconnect like this? Do I need a v3 hub? the blinds are deployed in pairs and the disconnecting one is not the farthest from the repeater/hub.