Sporadic warm transfer not working

Our office recently migrated to zoom. Sporadically our reception team cannot warm transfer calls, for instance not available in the morning, but ok in the afternoon or vice versa. They are using the softphone system. It does not matter if the person they are warm transferring to has the mobile app or desktop app, same result. All users are operating on the most current version of zoom. All users who are attempting to initiate the warm transfers have the powerpak licenses. Today I toggled on and off call overflow, call transferring, and call handling/forwarding in account settings, then had my team log out and log in. It seemed to do the trick. They had access to warm transfers again. However, this seems like it might be a bit of a pain to do every day. Any ideas on how to resolve this issue permanently?