When I play a profile with a gain setting more than 5.4 I get a sound like a gate or limiter coming in and out as a note diminishes. Help

When I use a profile that has a gain setting that is more 5.4
and I hold a single note on the guitar I get something that sounds like a
gate or limiter turning on and off as the note diminishes. I noticed it
while playing with the head phone on. You really have to listen if
playing through cabs. It is like a scratch on your new car not very big
but looks huge every time you look at it. It is there on stock profiles
and also user profiles. It drives me mad. I have talked to Christoph
Kemper about this but he tried to blame it on the guitar. It happens on
all of my guitars PRS custom 22, Gibson Les Paul Classic, James Tyler
Variax, Hamer Artist. Has anyone had the same problem? Help

Okay will do when I get home from home. Thank You

Nice one, you got me. Rushing before going to work made a mistake. I will have to wait until Monday have to go to the States until Monday afternoon. Thank you