There can be two scenarios about this development one positive and one negative.
The positive scenario may be that team found some security, privacy or code breach and trying to make sure that there are no stolen tokens that are sold on exchanges that is why they have halted the trading and will reactivate as soon as they think that threat is over and everything is clear.
The negative scenario may be that after raising good funds this project team has become greedy and its intentions have changed now and with hige money in hand now they do not want to continue the project rather just exit after making excuses and fake stories so that they can enjoy the money for rest of their lives.
I hope the positive scenario will come out to be true and investors will be safe.