playing at home and not familiar (sounded pretty bad) so had a look...... u said.... That's pretty volatile. They didn't get suspended for a second, hour, day, week year or even 4 years.
for the time u quoted they had at least 3 suspensions or halts in the period. during the period quoted they were suspended from 27 march until allowed to trade again by the ASX on 17 April. during this period u quoted ASX also directly asked them about market volatility ..... was that during a trading pause for the same?
interestingly the response given by that osx company to the asx after their trading halt for volatility on 23 April was massively different to the response that isx gave to the volatility query from asx on 12 September 2019.