This is just crazy, someone doesn't like when the retail is winning. Looking at the options flow for this, more than 100 million dollars have been spent on contracts today. Halting it all of a sudden only makes people lose money.
Here are the options flow stats, crazy amount being spent on options. https://i.gyazo.com/dca500ef0f774a0019f0a42b7ac1e855.png
Source: https://www.tradytics.com