I've used velcro with some success but the best fix was to use wedges to push the guides out to a point where friction kept the drawer in. Simply remove the drawer, loosen the right and left side guides and slip some thin cardboard between the track and drawer. Re-tighten the screws and re-install the drawer. If you get the friction you need, you are done, if not, rinse and repeat.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)