Both things mentioned have happened to me at Smuggs: I rode the chair up through the snow guns and I stuck to the ramp. Surprised the living heck out of me, but I missed getting hit by the chair by taking one jump downramp and sticking again. I frequently ski through the guns since I take first and last run on the weekends. the typical symptom is: all of a sudden, one ski will head for the woods, no matter what I do. Think turkey wishbone. Sometimes the only solution is to take off your skis, plant the offending one in the snow and use the other as a scraper.
I wax after every weekend as follows: light brush on the edges with a diamond stone to remove burrs and to check for sharpness. Quick brushdown with scotchbrite pad to take off ptex hairs (optional). Then I take my iron, purchased for $2 at the Salvation Army, set just hot enough to melt the wax, not hot enough to make the wax smoke, point down, apply wax block to iron and dribble wax the length of the ski. Iron the wax, it will film like magic and cover the entire bottom, do it just enough to warm the ski bottoms, being careful not to overheat any section. Let cool while I do the 2nd ski, scrape with a plastic ski scraper (I scored a bunch of them for $2 each at the Burton Factory Sale, otherwise, maybe $6 at the Alpine Shop), After the scraping doesn't produce any more wax shavings, use a nylon ski brush to finish up, it cleans out the structure, some would say it's an optional step. Forty minutes, tops. If I find the edges to be dull, I would do an edge job: Deburr with the diamond stone, put a mill bastard file in my jig, set for correct angles (1degree, base and edge) run the file along the edge. I bought the jig at the Burton sale, too. I used to use a thing with built-in mini files that you set for the desired angle, made by ToKo. It was OK, but I find the Burton thing more convenient, since you can buy new files at the hardware store and you can put stones in it, too. Anyways, after filing, I put a sharpening stone in the thing and repeat. Sharp, sharp, sharp. Fun, fun, fun. I asked for and got a set of ski vices for my birthday.
Actually, it is fun, which is why I went through the tedious explanation above. I encourage you to look into doing your own skis, because it is fun, it's cheap, it's fast and it really helps your ski technique. You turn smoother on well-waxed skis. With a little diligence, you can find all kinds of tuning info on the web. Tognar is a good place to start and they sell all kinds of stuff. Hell, this year I bought Swix wax in bulk from them and now have probably a lifetime supply for me and my kids. I only go to the shop for a stonegrind tune once, preseason, to start off with fresh structure.