Yes, this is an old KNOWN issue. Your gear will only stay linked if you are shooting in some area with NO wifi signals around. Canon has refused to acknowledge or address this issue in any way. You can waste time and money sending your gear to Canon,...
No, the new version 2 transmitter has the same issue. I suspect that this is why Canon refuses to acknowledge that there is a problem. They are well aware of it and would have to recall ALL of their flash triggers in order to fix it
