Did the shop that reset your light tell you what airbag code was stored? You're gonna need to figure that out first. Most cheapo code readers can't read airbag or abs lights. I haven't ran into intermittent airbag lights before. The most common cause of an airbag light I've seen were caused by a faulty airbag sensor or clock-spring. The only airbag light I've seen on a Mirage was caused by a side impact sensor not being plugged in properly after being repaired by a body shop.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)