Yesterday as I was buying more Fun tokens I noticed the caution up-top stating "funfair will be delisted on Feb 2nd 2018". Then shortly after, they changed the date from 2nd to the 9th.
If you have funfair on bittrex I recommend you sell or transfer to other exchange or myetherwallet.
There is not any assuring answer to why this is happening out of the blues, but my assumption is that bittrex is planning to introduce FIAT to their exchange platform and that there is fear fun tokens will potentially be considered as security and will be subject to tighter regulations. With that I have a feeling bittrex doesn't want anything to do with fun fair.
If you have funfair in bittrex sell them, or transfer them to My ether wallet or another exchange site.