Pots typically fail "open", so yeah. An open volume pot in a guitar could present as "stuck on". Depends where it failed. You could also have just lost the ground connection.
Grounds are all good.
Just stop working, and stuck open.
Was fine, and went and let my buddy connect it to his monster system, then it just stayed on..
These are the pots that I have been using [RS Guitarworks Superpots].
Tonar tuned me on to them a couple years ago and I have used them exclusively since. Never had a problem...
They're a Clarostat RV4 series milspec part. Tough to find - the link leads to the only place I know of. Downside to them for some users is they need set screw knobs. There's no splined shaft version available.
They're not cheap (~$13), but they're worth it if you want peace of mind. They're sealed, use real resistive elements, and are made of stainless. You want the 500K audio taper.
The problem with almost all pots these days is they use plastic resistive strips, which won't take much abuse. Often, soldering to the housing for grounds will either ruin or shorten the life of the part. Soldering to the pot's housing is never recommended, although even some OEMs do it. But, they're set up for it. You need a heavier iron that'll let you get on and off the pot in a hurry. For those of us who'd rather not worry use just ground lugs instead. There's a thread on them here. In the case of the milspec parts above, you don't have much choice but to use lugs due to the stainless housings.
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