Is this the first time you have used the camera to take photographs? Is not, did it flare with other film stocks or is this only isolated to the Lucky film?
I've shot several rolls with the camera and they've been fine. However, this was the first time I used Helios-44-2 lens and Lucky film. I don't shoot often with bright sunlight, but on those particular frames the sun was at about 2-3 o'clock.