FX Fx king 600 reg issue

Hello everyone. I have a FX KING 600 mm with a reg issue, i had it set at 148 bar , but if don’t shoot it for couples weeks the reg pressure goes up, 🤯 to 190 or more , that’s weird i never had any issues like that before , so I’m wondering if any body had/has an issue like this.
I stored my rifle in case standing up just like a rifle rack, I’m totally clueless, I hope someone can help to figure this out. thank you very much.
 
Regulator creep, you need to rebuild the regulator.

I haven’t really ever had this issue, but if i did it would not bother me much as i do not have a need for a 100 % first shot, so at the range i would just let it settle back in to the intended pressure, and then start to shoot the shots i would count on.
Thank you, that’s what I thought 💭 I really appreciated.