It is solely a function of the participating scanners. There is a report a problem link on each feed's page which allows you to let the provider know there is

It is solely a function of the participating scanners. There is a report a problem link on each feed's page which allows you to let the provider know there is a problem. There are a lot of times providers simply don't know that there is a quality problem. Edit: there are also a lot of problem vectors. Poor reception, failing equipment, old equipment, and even the case of some providers that don't care and just rush a feed online just to get the premium subscription. Crowdsourcing content isn't always easy :)