If that's the case, & you're using bitmains cgminer - you're losing potential earnings. You should use kano's cgminer for the S5 instead as mentioned a page or so back  

Edit: Just a heads up - Matt Corello has released an updated version of his excellent relaynodeclient with some huge performance improvements - p2pool users can benefit greatly by using his software:

http://bitcoinrelaynetwork.org/

https://github.com/TheBlueMatt/RelayNode

Nice stuff Matt