Can't say about getting paid by the factoring companies, but I can say they have been calling/emailing on pretty much every single load to confirm the rate and and no short payment etc.
It's not just new ones either, it's with carriers that are doing the same runs over & over.
One of them finally gave an answer when I asked why so many calls, their reply was they are getting a lot of fraud from the carriers. Ie their own customers.