I recently had my fender acoustasonic telecaster checked out because the volume kept shorting out. It seems the volume pot was dirty or had a short. Took it to my local fender guitar and fender electronic tech and they fixed it. But now, it's doing the same thing and I haven't had it 3 weeks from the shop. I love this guitar and I want a permanent fix...

Spray contact cleaner into the back of the control and work it up and down many times quickly to clean it and go get your money back from the shop.

If the problem is actually the volume knob, then the guitar shop did not fix it and you should bring it back. There is a test you can do to see if the problem is your volume knob. With the guitar unplugged, you can turn the knob up to the max and down to the min a lot of time (like 50-100 times or more) plug it back in and see if the problem is a little bit better, if it is I would bring it back to the repair shop and demand they fix it properly.

The problem could be the cable you are using. Sometimes it can seem like it's a volume knob problem when really it's a cable issue. Jiggle the cable and connector while the guitar is plugged in to see if the sound cuts out at all or you get crackling.