Raised margins * 4 times during trading?

1 margin requirements can be temporarily raised in response to key economic news announcements. These announcements are typically listed in the Upcoming Events Calendar on your NinjaTrader Account Dashboard. on dashboard there are many events such as related to forex ect… is for exemple mnq nasdq and mgc gold also raised ??? do they raise everthing 4times ? or specific instruments for specific news??? say agronews , will mnq mgc also raise ,?? do they say and where??

2 These elevated margins usually remain in place for about five minutes following the announcement, until market volatility is deemed manageable. where do they announce margin back to normal???says about until manageable so not exactly 5 min. where to find about???

3 Margin requirements can be raised temporarily for all instruments in response to specific market conditions, such as increased volatility or before news . i understand news, but margins raised 4times if volatility ???do the announce it during 5-6pm break?? or do they just raise them during day??

4 what about trade already in place?? will margin go up while in position?

Gffbrokers hugely raises margins. But not only that, they apply this high margin after the close of the PREVIOUS day. The raise continues till 1-2 hours after the opening of the next day. So 2-3 hours after the numbers came out.
They also charge very high commissions, and you should also pay each month a fix amount ($10) for administration. To make it complete they also charge you for the platform, despite the publicity they make for free platforms that you unfortunately never can take.
I have a friend who went to gffbrokers, he told me this story.
Avoid this broker!!!