*** bad_msg_notification: msg_id = 5993974159391378432, seq = 1, error = 17
*** bad_msg_notification: msg_id = 5993974159391378436, seq = 2, error = 17
*** bad_msg_notification: msg_id = 5993974159391378440, seq = 4, error = 17
*** bad_msg_notification: msg_id = 5993974159391378444, seq = 6, error = 17

I had these error messages sometimes too, even until seq = 20 or more, but as the messages sent by me or sent by other contacts to me were received correctly I didn't care about. The last days I'm not having the bad_msg_notifications.