Skin glue gobs up and sticks to base

I'm having trouble with skin glue which has me a bit perplexed. My wife and I both tele, I've been using the same pair of skis & skins for 4 years, whereas she's on the 2nd pair of skins in as many years and here's why. After about 2 seasons the skin glue decides it would much rather come off in big, blobby chunks and stay on the ski base instead of the skin. The stuff acts like old rubber cement - or if it was fabric, I would call it "pilling". The skis are Tua Cross-Rides, the skins are BD. The first time this happened, I took the skins back, and BD swapped them out. Fine, maybe a bad batch or something. Two years later and exactly the same problem; just spent half an hours with goo-remover scraping big blobs of sticky glue off her ski bases. We avoid heat and skins, dry the skins after every trip, promptly remove skins from skis when not in use and all that good stuff. We treat our skis and skins pretty much identically, and I've never had any problem with mine. Could there be something really weird about the Tua base which is de-stabilizing the glue?? Seems a long shot. But also seems unlikely that we could have gotten two bad pairs of skins out of BD ??? I hardly ever wax the skis. The bases were stone-ground and waxed between the two pairs of skins as well. Anyone else had this issue?
thanks,
Matt K

FWIW:
I have been using a pair of BD skins for four years and am still on the original goo.  I stick them together during the season, dry them unstuck after every trip, and store them with the mesh on during the off season.  I always wax my skis.  Occasionally I get a small bit of goo that sticks to my ski.
Last weekend I was with a friend who never waxes his ski and he fought goo retention all day, finally resorting to scrapping his ski with a knife and waxing, which improved his glide considerably.

Wax your skis. For backcountry use I would wax at the very least once every half dozen outings. For something that sees inbounds use, wax every couple of ski days. If you're cheap, you can use paraffin canning wax, but a big block of all temp from Hertel's is cheap and will last a season. Keep your eye on steepandcheap for a waxing iron or try and find an old iron at a tag sale. Ideally, you want a vintage one that has few steam holes in it.

To fix the pilling, put the contact paper your skins came with (if you still have it) on the glue and run a warm iron over the contact paper a few times to redistribute the glue. Put tape over the plush when you do this to prevent hot glue from gumming up the fabric. If youhave an old iron, you can put it directly on the glue, but you may need to reapply some afterward (use Gold Label).

Thanks, will try waxing. Guess I've just been lucky and lazy with my skis - Matt K

My G3 skins have globbed up. I wax my skis every other trip, and the glue just comes off like it is wet rubber cement. I tried the hot iron / release paper trick to no avail. I set them in a deep freezer for a week too.. any ideas?

Matt,
Black Diamond changed their glue recipe a few years back, and it's not quite as good as the old recipe, which explains your older skins working and the newer skins not. Keeping your skis waxed helps, as does the glue redistribution. But for the long term I've realized that every four years or so I just do a re glue which actually isn't that difficult. Simply cut strips of paper sacks and place them on the glue side, then hit it with a hot iron. This will take many passes (with clean paper strips)depending on how contaminated the glue is. When the skin is clean then apply new glue. Another alternative which I've done the past couple seasons with mohair race skins is to do this re glue annually which makes the process a lot quicker.