This one has baffled me. ANd sonicwall tech support is useless.
I'm experience 20% PL on a link between x.x.x.100 and x.x.x.3, a SBS box.
I have a TZ100 as my UTM.
When I unplug the TZ100 from the LAN switch. PL goes away. When I plug it back in, it goes up to 20%.
There is no PL direct to the gateway. It seems to be interfering somehow, and I can't track it down.
Any suggestions? Even basic ones, if I've tried it I'll say, but I have no clue at this point as to what's going on. Firmware is anywhere from stable release to early release, all versions cause this.