SRS light occasionally flashes during start up

[unity]

Have you ever ran your audio or sat nav without the engine running for over 10 minutes? It could be that the battery drain during the engine start up is causing the SRS system to turn off and on again in that split second.

Yes, recently I have been running my radio for 15-20 mins 2-3 times a week while waiting to pick up my daughter from school. So are you saying the battery is starting to drain? If this was the case wouldn't the battery indicator flash too as well as other indicators as well?