Not that your hitting this issue, but I had a few batches stall around 1.020 when I fermented at too low if a temperature (e.g. 58-59 using s-05). The fix was to buy a $21 digital temp controller and rig it to a 60 watt light bulb in a paint can.
Last n brews: (P=Primary) (K=Keg) (B=Keg->Bottle)
7/26: Flower Power(P) 6/13: Rolling Rock (K), 6/09: Yooper's Pale Ale (K), 5/27: Columbus IPA (K), 5/17: Victory Hop Devil (K), 5/15: Summit MO SMASH (K), 5/12: Sierra Nevada Celebration (K), 5/03: Schwartzbeir (B) 4/10: Birch Beer (Soda) (K), 3/31: Sierra Nevada Pale Ale (B), 3/25: Belgian Ale (SWMBO slayer) (B), 3/21: mrbowenz English IPA (B), 3/17: Mirror Pond Ale (K), 3/17: Blue Moon's "Old Country Cousin" (B), 3/15: Sculpin IPA (B),