On Jan 19, I brewed what will end up being a 5 gal. batch of Nut Brown Ale. I had decent mash efficiency and ended up at 1.046 @ 68 deg. after the boil and subsequent cool. I then split the total of six(6) gal of wort evenly into two sanitized corneys. The evening before I made a yeast starter with 2C water to 1/2C light DME and two packets of Safale S-04 dry Ale Yeast and left it on the stir plate with sanitized foil over the top of the flask. I pitched this yeast split evenly between the two corneys and sealed and shook/stirred the kegs. Then I installed my air locks which are nothing more than air in connectors with a copper tube for structure running through a vinyl tube to a regular air lock. I have used this method once before quite successfully. I stored these in the den with a brew belt around the middle of both kegs. After only a few hours, I started to see reasonable activity in the air locks. Just two days later we were hit with a cold snap that dropped the house temp to between 60 and 64. At that point, the activity stopped completely. It is now the 31st of Jan. The cold snap has been over for a couple days now but the former activity has not resumed.
Should I be concerned that the fermentation is completely stalled? Should I do something to restart it and if so, what?