I can only speak for myself, but no, I've got no statistics.
I wouldn't have suspected there could be such a problem, so I haven't especially been looking out for it. Even so, the tendency in my games has been obvious at times (several games in a row).
Now I learn that at least three other people have observed the exact same phenomenon. Sounds to me like it might be worth an investigation.
(Cacher) Si vous ne voulez pas que les autres utilisateurs sachent ce que vous êtes en train de faire sur ce site, vous pouvez changer les réglages (abonnés seulement) en activant le mode invisible. (pauloaguia) (Montrer toutes les astuces)