I guest you guys updated b3 to 1.4.x o higher. In this version there was an important change regarding schedulled tasks (used by this plugin)
Find the following lines (2 times):
b3.cron.OneTimeCronTab(self.update_vote, "*/1")
And replace the
1 for whatever you think is ok for you:
For example:
*/15 means 15 seconds, and so on.