Have you changed anything else in your set up recently?
More/different pedals in the chain? A different amp? Maybe you’re running your amp totally clean whereas you used to have it a bit crunchy? That sort of thing…
What I’m getting at, is that maybe the pedal has always done it but you didn’t notice before as other factors were masking the problem.
I had something similar happen with an old Vox pedal of mine; I had never noticed before, but I suddenly noticed a lot of effect bleed-through. In the end I replaced the switch and re-wired it to get better isolation.
